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Finding the Fourth Proportional to 15,155.78, 20,914.98 and 8,531.78

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Solution

The fourth proportional to 15,155.78, 20,914.98 and 8,531.78 is: 11,773.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,155.78 : 20,914.98 = 8,531.78 : x
  2. Step 2: Convert to fraction form
    15,155.78/20,914.98 = 8,531.78/x
  3. Step 3: Cross multiply
    15,155.78x = 20,914.98 × 8,531.78
  4. Step 4: Simplify right side
    15,155.78x = 178,442,008.06
  5. Step 5: Solve for x
    x = 178,442,008.06/15,155.78
  6. Step 6: Final answer
    x = 11,773.86

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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.