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Finding the Fourth Proportional to 138,613.80, 207,920.70 and 75,628.20

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Solution

The fourth proportional to 138,613.80, 207,920.70 and 75,628.20 is: 113,442.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,613.80 : 207,920.70 = 75,628.20 : x
  2. Step 2: Convert to fraction form
    138,613.80/207,920.70 = 75,628.20/x
  3. Step 3: Cross multiply
    138,613.80x = 207,920.70 × 75,628.20
  4. Step 4: Simplify right side
    138,613.80x = 15,724,668,283.74
  5. Step 5: Solve for x
    x = 15,724,668,283.74/138,613.80
  6. Step 6: Final answer
    x = 113,442.30

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1.5x scale

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.