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Finding the Fourth Proportional to 28,318.71, 39,079.97 and 15,572.71

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Solution

The fourth proportional to 28,318.71, 39,079.97 and 15,572.71 is: 21,490.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,318.71 : 39,079.97 = 15,572.71 : x
  2. Step 2: Convert to fraction form
    28,318.71/39,079.97 = 15,572.71/x
  3. Step 3: Cross multiply
    28,318.71x = 39,079.97 × 15,572.71
  4. Step 4: Simplify right side
    28,318.71x = 608,581,039.62
  5. Step 5: Solve for x
    x = 608,581,039.62/28,318.71
  6. Step 6: Final answer
    x = 21,490.42

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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.