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Finding the Fourth Proportional to 28,711.71, 42,902.85 and 21,919.71

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Solution

The fourth proportional to 28,711.71, 42,902.85 and 21,919.71 is: 32,753.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,711.71 : 42,902.85 = 21,919.71 : x
  2. Step 2: Convert to fraction form
    28,711.71/42,902.85 = 21,919.71/x
  3. Step 3: Cross multiply
    28,711.71x = 42,902.85 × 21,919.71
  4. Step 4: Simplify right side
    28,711.71x = 940,418,030.17
  5. Step 5: Solve for x
    x = 940,418,030.17/28,711.71
  6. Step 6: Final answer
    x = 32,753.81

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.