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Finding the Fourth Proportional to 100,699.39, 138,957.28 and 58,249.72

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Solution

The fourth proportional to 100,699.39, 138,957.28 and 58,249.72 is: 80,380.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,699.39 : 138,957.28 = 58,249.72 : x
  2. Step 2: Convert to fraction form
    100,699.39/138,957.28 = 58,249.72/x
  3. Step 3: Cross multiply
    100,699.39x = 138,957.28 × 58,249.72
  4. Step 4: Simplify right side
    100,699.39x = 8,094,222,651.96
  5. Step 5: Solve for x
    x = 8,094,222,651.96/100,699.39
  6. Step 6: Final answer
    x = 80,380.06

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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.