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Finding the Fourth Proportional to 1,240.76, 1,861.17 and 316.31

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Solution

The fourth proportional to 1,240.76, 1,861.17 and 316.31 is: 474.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,240.76 : 1,861.17 = 316.31 : x
  2. Step 2: Convert to fraction form
    1,240.76/1,861.17 = 316.31/x
  3. Step 3: Cross multiply
    1,240.76x = 1,861.17 × 316.31
  4. Step 4: Simplify right side
    1,240.76x = 588,711.34
  5. Step 5: Solve for x
    x = 588,711.34/1,240.76
  6. Step 6: Final answer
    x = 474.48

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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.