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Finding the Fourth Proportional to 1,011.54, 1,517.26 and 318.12

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Solution

The fourth proportional to 1,011.54, 1,517.26 and 318.12 is: 477.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,011.54 : 1,517.26 = 318.12 : x
  2. Step 2: Convert to fraction form
    1,011.54/1,517.26 = 318.12/x
  3. Step 3: Cross multiply
    1,011.54x = 1,517.26 × 318.12
  4. Step 4: Simplify right side
    1,011.54x = 482,669.97
  5. Step 5: Solve for x
    x = 482,669.97/1,011.54
  6. Step 6: Final answer
    x = 477.16

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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.