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Finding the Fourth Proportional to 498.24, 687.86 and 387.47

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Solution

The fourth proportional to 498.24, 687.86 and 387.47 is: 534.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    498.24 : 687.86 = 387.47 : x
  2. Step 2: Convert to fraction form
    498.24/687.86 = 387.47/x
  3. Step 3: Cross multiply
    498.24x = 687.86 × 387.47
  4. Step 4: Simplify right side
    498.24x = 266,523.18
  5. Step 5: Solve for x
    x = 266,523.18/498.24
  6. Step 6: Final answer
    x = 534.93

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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.