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Finding the Fourth Proportional to 498.13, 687.20 and 288.29

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Solution

The fourth proportional to 498.13, 687.20 and 288.29 is: 397.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    498.13 : 687.20 = 288.29 : x
  2. Step 2: Convert to fraction form
    498.13/687.20 = 288.29/x
  3. Step 3: Cross multiply
    498.13x = 687.20 × 288.29
  4. Step 4: Simplify right side
    498.13x = 198,113.16
  5. Step 5: Solve for x
    x = 198,113.16/498.13
  6. Step 6: Final answer
    x = 397.72

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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.