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Finding the Fourth Proportional to 688.97, 1,033.16 and 428.58

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Solution

The fourth proportional to 688.97, 1,033.16 and 428.58 is: 642.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.97 : 1,033.16 = 428.58 : x
  2. Step 2: Convert to fraction form
    688.97/1,033.16 = 428.58/x
  3. Step 3: Cross multiply
    688.97x = 1,033.16 × 428.58
  4. Step 4: Simplify right side
    688.97x = 442,789.57
  5. Step 5: Solve for x
    x = 442,789.57/688.97
  6. Step 6: Final answer
    x = 642.68

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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.