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Finding the Fourth Proportional to 689.31, 1,034.31 and 458.28

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Solution

The fourth proportional to 689.31, 1,034.31 and 458.28 is: 687.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    689.31 : 1,034.31 = 458.28 : x
  2. Step 2: Convert to fraction form
    689.31/1,034.31 = 458.28/x
  3. Step 3: Cross multiply
    689.31x = 1,034.31 × 458.28
  4. Step 4: Simplify right side
    689.31x = 474,003.59
  5. Step 5: Solve for x
    x = 474,003.59/689.31
  6. Step 6: Final answer
    x = 687.65

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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.