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Finding the Fourth Proportional to 689.53, 1,034.81 and 429.92

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Solution

The fourth proportional to 689.53, 1,034.81 and 429.92 is: 645.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    689.53 : 1,034.81 = 429.92 : x
  2. Step 2: Convert to fraction form
    689.53/1,034.81 = 429.92/x
  3. Step 3: Cross multiply
    689.53x = 1,034.81 × 429.92
  4. Step 4: Simplify right side
    689.53x = 444,885.52
  5. Step 5: Solve for x
    x = 444,885.52/689.53
  6. Step 6: Final answer
    x = 645.20

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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.