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Finding the Fourth Proportional to 139,062.60, 208,545.30 and 72,480.60

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Solution

The fourth proportional to 139,062.60, 208,545.30 and 72,480.60 is: 108,695.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,062.60 : 208,545.30 = 72,480.60 : x
  2. Step 2: Convert to fraction form
    139,062.60/208,545.30 = 72,480.60/x
  3. Step 3: Cross multiply
    139,062.60x = 208,545.30 × 72,480.60
  4. Step 4: Simplify right side
    139,062.60x = 15,115,488,471.18
  5. Step 5: Solve for x
    x = 15,115,488,471.18/139,062.60
  6. Step 6: Final answer
    x = 108,695.57

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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.