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Finding the Fourth Proportional to 742.90, 1,115.44 and 512.14

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Solution

The fourth proportional to 742.90, 1,115.44 and 512.14 is: 768.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    742.90 : 1,115.44 = 512.14 : x
  2. Step 2: Convert to fraction form
    742.90/1,115.44 = 512.14/x
  3. Step 3: Cross multiply
    742.90x = 1,115.44 × 512.14
  4. Step 4: Simplify right side
    742.90x = 571,261.44
  5. Step 5: Solve for x
    x = 571,261.44/742.90
  6. Step 6: Final answer
    x = 768.96

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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.