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Finding the Fourth Proportional to 28,129.34, 38,818.32 and 15,554

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Solution

The fourth proportional to 28,129.34, 38,818.32 and 15,554 is: 21,464.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,129.34 : 38,818.32 = 15,554 : x
  2. Step 2: Convert to fraction form
    28,129.34/38,818.32 = 15,554/x
  3. Step 3: Cross multiply
    28,129.34x = 38,818.32 × 15,554
  4. Step 4: Simplify right side
    28,129.34x = 603,780,149.28
  5. Step 5: Solve for x
    x = 603,780,149.28/28,129.34
  6. Step 6: Final answer
    x = 21,464.43

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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.