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Finding the Fourth Proportional to 100,719.60, 138,990.27 and 55,397.58

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Solution

The fourth proportional to 100,719.60, 138,990.27 and 55,397.58 is: 76,447.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,719.60 : 138,990.27 = 55,397.58 : x
  2. Step 2: Convert to fraction form
    100,719.60/138,990.27 = 55,397.58/x
  3. Step 3: Cross multiply
    100,719.60x = 138,990.27 × 55,397.58
  4. Step 4: Simplify right side
    100,719.60x = 7,699,724,601.55
  5. Step 5: Solve for x
    x = 7,699,724,601.55/100,719.60
  6. Step 6: Final answer
    x = 76,447.13

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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.