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Finding the Fourth Proportional to 1,011.85, 1,517.68 and 281.46

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Solution

The fourth proportional to 1,011.85, 1,517.68 and 281.46 is: 422.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,011.85 : 1,517.68 = 281.46 : x
  2. Step 2: Convert to fraction form
    1,011.85/1,517.68 = 281.46/x
  3. Step 3: Cross multiply
    1,011.85x = 1,517.68 × 281.46
  4. Step 4: Simplify right side
    1,011.85x = 427,166.21
  5. Step 5: Solve for x
    x = 427,166.21/1,011.85
  6. Step 6: Final answer
    x = 422.16

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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.