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Finding the Fourth Proportional to 680,925.52, 939,641.20 and 390,522.12

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Solution

The fourth proportional to 680,925.52, 939,641.20 and 390,522.12 is: 538,899.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    680,925.52 : 939,641.20 = 390,522.12 : x
  2. Step 2: Convert to fraction form
    680,925.52/939,641.20 = 390,522.12/x
  3. Step 3: Cross multiply
    680,925.52x = 939,641.20 × 390,522.12
  4. Step 4: Simplify right side
    680,925.52x = 366,950,673,463.34
  5. Step 5: Solve for x
    x = 366,950,673,463.34/680,925.52
  6. Step 6: Final answer
    x = 538,899.87

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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.