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Finding the Fourth Proportional to 680,915.52, 939,627.42 and 390,512.10

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Solution

The fourth proportional to 680,915.52, 939,627.42 and 390,512.10 is: 538,886.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    680,915.52 : 939,627.42 = 390,512.10 : x
  2. Step 2: Convert to fraction form
    680,915.52/939,627.42 = 390,512.10/x
  3. Step 3: Cross multiply
    680,915.52x = 939,627.42 × 390,512.10
  4. Step 4: Simplify right side
    680,915.52x = 366,935,877,001.78
  5. Step 5: Solve for x
    x = 366,935,877,001.78/680,915.52
  6. Step 6: Final answer
    x = 538,886.05

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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.