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Finding the Fourth Proportional to 21,124, 29,124.60 and 13,557

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Solution

The fourth proportional to 21,124, 29,124.60 and 13,557 is: 18,691.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,124 : 29,124.60 = 13,557 : x
  2. Step 2: Convert to fraction form
    21,124/29,124.60 = 13,557/x
  3. Step 3: Cross multiply
    21,124x = 29,124.60 × 13,557
  4. Step 4: Simplify right side
    21,124x = 394,842,202.20
  5. Step 5: Solve for x
    x = 394,842,202.20/21,124
  6. Step 6: Final answer
    x = 18,691.64

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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.