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Finding the Fourth Proportional to 139,921.20, 209,881.80 and 80,726.40

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Solution

The fourth proportional to 139,921.20, 209,881.80 and 80,726.40 is: 121,089.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,921.20 : 209,881.80 = 80,726.40 : x
  2. Step 2: Convert to fraction form
    139,921.20/209,881.80 = 80,726.40/x
  3. Step 3: Cross multiply
    139,921.20x = 209,881.80 × 80,726.40
  4. Step 4: Simplify right side
    139,921.20x = 16,943,002,139.52
  5. Step 5: Solve for x
    x = 16,943,002,139.52/139,921.20
  6. Step 6: Final answer
    x = 121,089.60

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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.