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Finding the Fourth Proportional to 498.68, 688.20 and 288.84

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Solution

The fourth proportional to 498.68, 688.20 and 288.84 is: 398.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    498.68 : 688.20 = 288.84 : x
  2. Step 2: Convert to fraction form
    498.68/688.20 = 288.84/x
  3. Step 3: Cross multiply
    498.68x = 688.20 × 288.84
  4. Step 4: Simplify right side
    498.68x = 198,778.24
  5. Step 5: Solve for x
    x = 198,778.24/498.68
  6. Step 6: Final answer
    x = 398.61

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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.