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Finding the Fourth Proportional to 92,428.71, 138,738.78 and 56,915.61

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Solution

The fourth proportional to 92,428.71, 138,738.78 and 56,915.61 is: 85,432.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,428.71 : 138,738.78 = 56,915.61 : x
  2. Step 2: Convert to fraction form
    92,428.71/138,738.78 = 56,915.61/x
  3. Step 3: Cross multiply
    92,428.71x = 138,738.78 × 56,915.61
  4. Step 4: Simplify right side
    92,428.71x = 7,896,402,294.36
  5. Step 5: Solve for x
    x = 7,896,402,294.36/92,428.71
  6. Step 6: Final answer
    x = 85,432.35

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.