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Finding the Fourth Proportional to 15,101.70, 20,840.55 and 8,387.76

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Solution

The fourth proportional to 15,101.70, 20,840.55 and 8,387.76 is: 11,575.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,101.70 : 20,840.55 = 8,387.76 : x
  2. Step 2: Convert to fraction form
    15,101.70/20,840.55 = 8,387.76/x
  3. Step 3: Cross multiply
    15,101.70x = 20,840.55 × 8,387.76
  4. Step 4: Simplify right side
    15,101.70x = 174,805,531.67
  5. Step 5: Solve for x
    x = 174,805,531.67/15,101.70
  6. Step 6: Final answer
    x = 11,575.22

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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.