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Finding the Fourth Proportional to 498.30, 687.72 and 301.80

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Solution

The fourth proportional to 498.30, 687.72 and 301.80 is: 416.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    498.30 : 687.72 = 301.80 : x
  2. Step 2: Convert to fraction form
    498.30/687.72 = 301.80/x
  3. Step 3: Cross multiply
    498.30x = 687.72 × 301.80
  4. Step 4: Simplify right side
    498.30x = 207,553.90
  5. Step 5: Solve for x
    x = 207,553.90/498.30
  6. Step 6: Final answer
    x = 416.52

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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.