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Finding the Fourth Proportional to 712,603.80, 983,393.34 and 390,325.38

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Solution

The fourth proportional to 712,603.80, 983,393.34 and 390,325.38 is: 538,649.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    712,603.80 : 983,393.34 = 390,325.38 : x
  2. Step 2: Convert to fraction form
    712,603.80/983,393.34 = 390,325.38/x
  3. Step 3: Cross multiply
    712,603.80x = 983,393.34 × 390,325.38
  4. Step 4: Simplify right side
    712,603.80x = 383,843,379,124.97
  5. Step 5: Solve for x
    x = 383,843,379,124.97/712,603.80
  6. Step 6: Final answer
    x = 538,649.08

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.