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Finding the Fourth Proportional to 1,011.64, 1,517.56 and 281.21

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Solution

The fourth proportional to 1,011.64, 1,517.56 and 281.21 is: 421.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,011.64 : 1,517.56 = 281.21 : x
  2. Step 2: Convert to fraction form
    1,011.64/1,517.56 = 281.21/x
  3. Step 3: Cross multiply
    1,011.64x = 1,517.56 × 281.21
  4. Step 4: Simplify right side
    1,011.64x = 426,753.05
  5. Step 5: Solve for x
    x = 426,753.05/1,011.64
  6. Step 6: Final answer
    x = 421.84

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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.