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Finding the Fourth Proportional to 498.92, 688.66 and 289.24

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Solution

The fourth proportional to 498.92, 688.66 and 289.24 is: 399.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    498.92 : 688.66 = 289.24 : x
  2. Step 2: Convert to fraction form
    498.92/688.66 = 289.24/x
  3. Step 3: Cross multiply
    498.92x = 688.66 × 289.24
  4. Step 4: Simplify right side
    498.92x = 199,188.02
  5. Step 5: Solve for x
    x = 199,188.02/498.92
  6. Step 6: Final answer
    x = 399.24

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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.