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Finding the Fourth Proportional to 498.48, 687.87 and 288.66

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Solution

The fourth proportional to 498.48, 687.87 and 288.66 is: 398.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    498.48 : 687.87 = 288.66 : x
  2. Step 2: Convert to fraction form
    498.48/687.87 = 288.66/x
  3. Step 3: Cross multiply
    498.48x = 687.87 × 288.66
  4. Step 4: Simplify right side
    498.48x = 198,560.55
  5. Step 5: Solve for x
    x = 198,560.55/498.48
  6. Step 6: Final answer
    x = 398.33

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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.