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Finding the Fourth Proportional to 498.69, 688.28 and 289

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Solution

The fourth proportional to 498.69, 688.28 and 289 is: 398.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    498.69 : 688.28 = 289 : x
  2. Step 2: Convert to fraction form
    498.69/688.28 = 289/x
  3. Step 3: Cross multiply
    498.69x = 688.28 × 289
  4. Step 4: Simplify right side
    498.69x = 198,912.92
  5. Step 5: Solve for x
    x = 198,912.92/498.69
  6. Step 6: Final answer
    x = 398.87

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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.