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Finding the Fourth Proportional to 498.32, 687.56 and 318.94

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Solution

The fourth proportional to 498.32, 687.56 and 318.94 is: 440.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    498.32 : 687.56 = 318.94 : x
  2. Step 2: Convert to fraction form
    498.32/687.56 = 318.94/x
  3. Step 3: Cross multiply
    498.32x = 687.56 × 318.94
  4. Step 4: Simplify right side
    498.32x = 219,290.39
  5. Step 5: Solve for x
    x = 219,290.39/498.32
  6. Step 6: Final answer
    x = 440.06

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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.