Home / 712,427.50-983,116.04-390,139.34

Finding the Fourth Proportional to 712,427.50, 983,116.04 and 390,139.34

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Solution

The fourth proportional to 712,427.50, 983,116.04 and 390,139.34 is: 538,373.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    712,427.50 : 983,116.04 = 390,139.34 : x
  2. Step 2: Convert to fraction form
    712,427.50/983,116.04 = 390,139.34/x
  3. Step 3: Cross multiply
    712,427.50x = 983,116.04 × 390,139.34
  4. Step 4: Simplify right side
    712,427.50x = 383,552,236,122.74
  5. Step 5: Solve for x
    x = 383,552,236,122.74/712,427.50
  6. Step 6: Final answer
    x = 538,373.71

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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.