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Finding the Fourth Proportional to 28,129, 38,818.48 and 15,553.76

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Solution

The fourth proportional to 28,129, 38,818.48 and 15,553.76 is: 21,464.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,129 : 38,818.48 = 15,553.76 : x
  2. Step 2: Convert to fraction form
    28,129/38,818.48 = 15,553.76/x
  3. Step 3: Cross multiply
    28,129x = 38,818.48 × 15,553.76
  4. Step 4: Simplify right side
    28,129x = 603,773,321.48
  5. Step 5: Solve for x
    x = 603,773,321.48/28,129
  6. Step 6: Final answer
    x = 21,464.44

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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.