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Finding the Fourth Proportional to 138,867.20, 208,300.80 and 72,437.08

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Solution

The fourth proportional to 138,867.20, 208,300.80 and 72,437.08 is: 108,655.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,867.20 : 208,300.80 = 72,437.08 : x
  2. Step 2: Convert to fraction form
    138,867.20/208,300.80 = 72,437.08/x
  3. Step 3: Cross multiply
    138,867.20x = 208,300.80 × 72,437.08
  4. Step 4: Simplify right side
    138,867.20x = 15,088,700,672.16
  5. Step 5: Solve for x
    x = 15,088,700,672.16/138,867.20
  6. Step 6: Final answer
    x = 108,655.61

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.