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Finding the Fourth Proportional to 21,532.71, 29,715.05 and 11,972.31

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Solution

The fourth proportional to 21,532.71, 29,715.05 and 11,972.31 is: 16,521.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,532.71 : 29,715.05 = 11,972.31 : x
  2. Step 2: Convert to fraction form
    21,532.71/29,715.05 = 11,972.31/x
  3. Step 3: Cross multiply
    21,532.71x = 29,715.05 × 11,972.31
  4. Step 4: Simplify right side
    21,532.71x = 355,757,708.76
  5. Step 5: Solve for x
    x = 355,757,708.76/21,532.71
  6. Step 6: Final answer
    x = 16,521.73

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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.