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Finding the Fourth Proportional to 498.39, 687.79 and 274.34

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Solution

The fourth proportional to 498.39, 687.79 and 274.34 is: 378.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    498.39 : 687.79 = 274.34 : x
  2. Step 2: Convert to fraction form
    498.39/687.79 = 274.34/x
  3. Step 3: Cross multiply
    498.39x = 687.79 × 274.34
  4. Step 4: Simplify right side
    498.39x = 188,690.37
  5. Step 5: Solve for x
    x = 188,690.37/498.39
  6. Step 6: Final answer
    x = 378.60

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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.