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Finding the Fourth Proportional to 100,871.72, 139,236.54 and 69,132.68

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Solution

The fourth proportional to 100,871.72, 139,236.54 and 69,132.68 is: 95,426.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,871.72 : 139,236.54 = 69,132.68 : x
  2. Step 2: Convert to fraction form
    100,871.72/139,236.54 = 69,132.68/x
  3. Step 3: Cross multiply
    100,871.72x = 139,236.54 × 69,132.68
  4. Step 4: Simplify right side
    100,871.72x = 9,625,795,164.13
  5. Step 5: Solve for x
    x = 9,625,795,164.13/100,871.72
  6. Step 6: Final answer
    x = 95,426.10

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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.