Home / 138,320.40-207,147.98-78,976.20

Finding the Fourth Proportional to 138,320.40, 207,147.98 and 78,976.20

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Solution

The fourth proportional to 138,320.40, 207,147.98 and 78,976.20 is: 118,274.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,320.40 : 207,147.98 = 78,976.20 : x
  2. Step 2: Convert to fraction form
    138,320.40/207,147.98 = 78,976.20/x
  3. Step 3: Cross multiply
    138,320.40x = 207,147.98 × 78,976.20
  4. Step 4: Simplify right side
    138,320.40x = 16,359,760,298.08
  5. Step 5: Solve for x
    x = 16,359,760,298.08/138,320.40
  6. Step 6: Final answer
    x = 118,274.39

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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.