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Finding the Fourth Proportional to 498.34, 687.76 and 288.56

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Solution

The fourth proportional to 498.34, 687.76 and 288.56 is: 398.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    498.34 : 687.76 = 288.56 : x
  2. Step 2: Convert to fraction form
    498.34/687.76 = 288.56/x
  3. Step 3: Cross multiply
    498.34x = 687.76 × 288.56
  4. Step 4: Simplify right side
    498.34x = 198,460.03
  5. Step 5: Solve for x
    x = 198,460.03/498.34
  6. Step 6: Final answer
    x = 398.24

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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.