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Finding the Fourth Proportional to 138,005.20, 207,007.80 and 84,861.10

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Solution

The fourth proportional to 138,005.20, 207,007.80 and 84,861.10 is: 127,291.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,005.20 : 207,007.80 = 84,861.10 : x
  2. Step 2: Convert to fraction form
    138,005.20/207,007.80 = 84,861.10/x
  3. Step 3: Cross multiply
    138,005.20x = 207,007.80 × 84,861.10
  4. Step 4: Simplify right side
    138,005.20x = 17,566,909,616.58
  5. Step 5: Solve for x
    x = 17,566,909,616.58/138,005.20
  6. Step 6: Final answer
    x = 127,291.65

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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.