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Finding the Fourth Proportional to 100,540.80, 138,711.58 and 64,263.47

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Solution

The fourth proportional to 100,540.80, 138,711.58 and 64,263.47 is: 88,661.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,540.80 : 138,711.58 = 64,263.47 : x
  2. Step 2: Convert to fraction form
    100,540.80/138,711.58 = 64,263.47/x
  3. Step 3: Cross multiply
    100,540.80x = 138,711.58 × 64,263.47
  4. Step 4: Simplify right side
    100,540.80x = 8,914,087,020.14
  5. Step 5: Solve for x
    x = 8,914,087,020.14/100,540.80
  6. Step 6: Final answer
    x = 88,661.39

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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.