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Finding the Fourth Proportional to 498, 687.33 and 288.31

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Solution

The fourth proportional to 498, 687.33 and 288.31 is: 397.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    498 : 687.33 = 288.31 : x
  2. Step 2: Convert to fraction form
    498/687.33 = 288.31/x
  3. Step 3: Cross multiply
    498x = 687.33 × 288.31
  4. Step 4: Simplify right side
    498x = 198,164.11
  5. Step 5: Solve for x
    x = 198,164.11/498
  6. Step 6: Final answer
    x = 397.92

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.