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Finding the Fourth Proportional to 498.29, 687.60 and 274.20

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Solution

The fourth proportional to 498.29, 687.60 and 274.20 is: 378.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    498.29 : 687.60 = 274.20 : x
  2. Step 2: Convert to fraction form
    498.29/687.60 = 274.20/x
  3. Step 3: Cross multiply
    498.29x = 687.60 × 274.20
  4. Step 4: Simplify right side
    498.29x = 188,539.92
  5. Step 5: Solve for x
    x = 188,539.92/498.29
  6. Step 6: Final answer
    x = 378.37

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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.