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Finding the Fourth Proportional to 126,061.60, 188,842.80 and 81,719.20

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Solution

The fourth proportional to 126,061.60, 188,842.80 and 81,719.20 is: 122,417.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    126,061.60 : 188,842.80 = 81,719.20 : x
  2. Step 2: Convert to fraction form
    126,061.60/188,842.80 = 81,719.20/x
  3. Step 3: Cross multiply
    126,061.60x = 188,842.80 × 81,719.20
  4. Step 4: Simplify right side
    126,061.60x = 15,432,082,541.76
  5. Step 5: Solve for x
    x = 15,432,082,541.76/126,061.60
  6. Step 6: Final answer
    x = 122,417.00

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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.