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Finding the Fourth Proportional to 498.20, 687.49 and 277.15

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Solution

The fourth proportional to 498.20, 687.49 and 277.15 is: 382.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    498.20 : 687.49 = 277.15 : x
  2. Step 2: Convert to fraction form
    498.20/687.49 = 277.15/x
  3. Step 3: Cross multiply
    498.20x = 687.49 × 277.15
  4. Step 4: Simplify right side
    498.20x = 190,535.44
  5. Step 5: Solve for x
    x = 190,535.44/498.20
  6. Step 6: Final answer
    x = 382.45

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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.