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Finding the Fourth Proportional to 15,101.61, 20,840.50 and 8,387.87

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Solution

The fourth proportional to 15,101.61, 20,840.50 and 8,387.87 is: 11,575.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,101.61 : 20,840.50 = 8,387.87 : x
  2. Step 2: Convert to fraction form
    15,101.61/20,840.50 = 8,387.87/x
  3. Step 3: Cross multiply
    15,101.61x = 20,840.50 × 8,387.87
  4. Step 4: Simplify right side
    15,101.61x = 174,807,300.53
  5. Step 5: Solve for x
    x = 174,807,300.53/15,101.61
  6. Step 6: Final answer
    x = 11,575.41

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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.