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Finding the Fourth Proportional to 100,718.60, 138,988.89 and 55,396.58

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Solution

The fourth proportional to 100,718.60, 138,988.89 and 55,396.58 is: 76,445.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,718.60 : 138,988.89 = 55,396.58 : x
  2. Step 2: Convert to fraction form
    100,718.60/138,988.89 = 55,396.58/x
  3. Step 3: Cross multiply
    100,718.60x = 138,988.89 × 55,396.58
  4. Step 4: Simplify right side
    100,718.60x = 7,699,508,469.05
  5. Step 5: Solve for x
    x = 7,699,508,469.05/100,718.60
  6. Step 6: Final answer
    x = 76,445.75

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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.