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Finding the Fourth Proportional to 39,685.76, 54,766.76 and 21,781.92

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Solution

The fourth proportional to 39,685.76, 54,766.76 and 21,781.92 is: 30,059.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,685.76 : 54,766.76 = 21,781.92 : x
  2. Step 2: Convert to fraction form
    39,685.76/54,766.76 = 21,781.92/x
  3. Step 3: Cross multiply
    39,685.76x = 54,766.76 × 21,781.92
  4. Step 4: Simplify right side
    39,685.76x = 1,192,925,184.98
  5. Step 5: Solve for x
    x = 1,192,925,184.98/39,685.76
  6. Step 6: Final answer
    x = 30,059.28

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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.