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Finding the Fourth Proportional to 138,454.98, 208,115.98 and 91,372.63

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Solution

The fourth proportional to 138,454.98, 208,115.98 and 91,372.63 is: 137,345.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,454.98 : 208,115.98 = 91,372.63 : x
  2. Step 2: Convert to fraction form
    138,454.98/208,115.98 = 91,372.63/x
  3. Step 3: Cross multiply
    138,454.98x = 208,115.98 × 91,372.63
  4. Step 4: Simplify right side
    138,454.98x = 19,016,104,593.09
  5. Step 5: Solve for x
    x = 19,016,104,593.09/138,454.98
  6. Step 6: Final answer
    x = 137,345.04

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.