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Finding the Fourth Proportional to 1,142.75, 1,714.13 and 458.75

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Solution

The fourth proportional to 1,142.75, 1,714.13 and 458.75 is: 688.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,142.75 : 1,714.13 = 458.75 : x
  2. Step 2: Convert to fraction form
    1,142.75/1,714.13 = 458.75/x
  3. Step 3: Cross multiply
    1,142.75x = 1,714.13 × 458.75
  4. Step 4: Simplify right side
    1,142.75x = 786,357.14
  5. Step 5: Solve for x
    x = 786,357.14/1,142.75
  6. Step 6: Final answer
    x = 688.13

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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.