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Finding the Fourth Proportional to 100,398.60, 138,610.10 and 62,723.88

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Solution

The fourth proportional to 100,398.60, 138,610.10 and 62,723.88 is: 86,596.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,398.60 : 138,610.10 = 62,723.88 : x
  2. Step 2: Convert to fraction form
    100,398.60/138,610.10 = 62,723.88/x
  3. Step 3: Cross multiply
    100,398.60x = 138,610.10 × 62,723.88
  4. Step 4: Simplify right side
    100,398.60x = 8,694,163,279.19
  5. Step 5: Solve for x
    x = 8,694,163,279.19/100,398.60
  6. Step 6: Final answer
    x = 86,596.46

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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.