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Finding the Fourth Proportional to 29,210.66, 40,310.65 and 15,781.87

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Solution

The fourth proportional to 29,210.66, 40,310.65 and 15,781.87 is: 21,778.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    29,210.66 : 40,310.65 = 15,781.87 : x
  2. Step 2: Convert to fraction form
    29,210.66/40,310.65 = 15,781.87/x
  3. Step 3: Cross multiply
    29,210.66x = 40,310.65 × 15,781.87
  4. Step 4: Simplify right side
    29,210.66x = 636,177,437.92
  5. Step 5: Solve for x
    x = 636,177,437.92/29,210.66
  6. Step 6: Final answer
    x = 21,778.95

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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.