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Finding the Fourth Proportional to 139,008.60, 208,707.30 and 86,520.60

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Solution

The fourth proportional to 139,008.60, 208,707.30 and 86,520.60 is: 129,901.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,008.60 : 208,707.30 = 86,520.60 : x
  2. Step 2: Convert to fraction form
    139,008.60/208,707.30 = 86,520.60/x
  3. Step 3: Cross multiply
    139,008.60x = 208,707.30 × 86,520.60
  4. Step 4: Simplify right side
    139,008.60x = 18,057,480,820.38
  5. Step 5: Solve for x
    x = 18,057,480,820.38/139,008.60
  6. Step 6: Final answer
    x = 129,901.90

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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.