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Finding the Fourth Proportional to 712,673.84, 983,490.12 and 390,395.54

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Solution

The fourth proportional to 712,673.84, 983,490.12 and 390,395.54 is: 538,745.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    712,673.84 : 983,490.12 = 390,395.54 : x
  2. Step 2: Convert to fraction form
    712,673.84/983,490.12 = 390,395.54/x
  3. Step 3: Cross multiply
    712,673.84x = 983,490.12 × 390,395.54
  4. Step 4: Simplify right side
    712,673.84x = 383,950,156,482.07
  5. Step 5: Solve for x
    x = 383,950,156,482.07/712,673.84
  6. Step 6: Final answer
    x = 538,745.97

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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.