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Finding the Fourth Proportional to 498.33, 687.23 and 311.56

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Solution

The fourth proportional to 498.33, 687.23 and 311.56 is: 429.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    498.33 : 687.23 = 311.56 : x
  2. Step 2: Convert to fraction form
    498.33/687.23 = 311.56/x
  3. Step 3: Cross multiply
    498.33x = 687.23 × 311.56
  4. Step 4: Simplify right side
    498.33x = 214,110.10
  5. Step 5: Solve for x
    x = 214,110.10/498.33
  6. Step 6: Final answer
    x = 429.66

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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.