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Finding the Fourth Proportional to 15,508.78, 21,404.16 and 15,086.58

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Solution

The fourth proportional to 15,508.78, 21,404.16 and 15,086.58 is: 20,821.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,508.78 : 21,404.16 = 15,086.58 : x
  2. Step 2: Convert to fraction form
    15,508.78/21,404.16 = 15,086.58/x
  3. Step 3: Cross multiply
    15,508.78x = 21,404.16 × 15,086.58
  4. Step 4: Simplify right side
    15,508.78x = 322,915,572.17
  5. Step 5: Solve for x
    x = 322,915,572.17/15,508.78
  6. Step 6: Final answer
    x = 20,821.47

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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.