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Finding the Fourth Proportional to 28,155.28, 38,854.56 and 15,580

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Solution

The fourth proportional to 28,155.28, 38,854.56 and 15,580 is: 21,500.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,155.28 : 38,854.56 = 15,580 : x
  2. Step 2: Convert to fraction form
    28,155.28/38,854.56 = 15,580/x
  3. Step 3: Cross multiply
    28,155.28x = 38,854.56 × 15,580
  4. Step 4: Simplify right side
    28,155.28x = 605,354,044.80
  5. Step 5: Solve for x
    x = 605,354,044.80/28,155.28
  6. Step 6: Final answer
    x = 21,500.55

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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.