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Finding the Fourth Proportional to 28,640.16, 42,949.71 and 9,915.39

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Solution

The fourth proportional to 28,640.16, 42,949.71 and 9,915.39 is: 14,869.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,640.16 : 42,949.71 = 9,915.39 : x
  2. Step 2: Convert to fraction form
    28,640.16/42,949.71 = 9,915.39/x
  3. Step 3: Cross multiply
    28,640.16x = 42,949.71 × 9,915.39
  4. Step 4: Simplify right side
    28,640.16x = 425,863,125.04
  5. Step 5: Solve for x
    x = 425,863,125.04/28,640.16
  6. Step 6: Final answer
    x = 14,869.44

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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.