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Finding the Fourth Proportional to 498.48, 687.78 and 291.48

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Solution

The fourth proportional to 498.48, 687.78 and 291.48 is: 402.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    498.48 : 687.78 = 291.48 : x
  2. Step 2: Convert to fraction form
    498.48/687.78 = 291.48/x
  3. Step 3: Cross multiply
    498.48x = 687.78 × 291.48
  4. Step 4: Simplify right side
    498.48x = 200,474.11
  5. Step 5: Solve for x
    x = 200,474.11/498.48
  6. Step 6: Final answer
    x = 402.17

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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.