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Finding the Fourth Proportional to 343.24, 514.87 and 99.79

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Solution

The fourth proportional to 343.24, 514.87 and 99.79 is: 149.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    343.24 : 514.87 = 99.79 : x
  2. Step 2: Convert to fraction form
    343.24/514.87 = 99.79/x
  3. Step 3: Cross multiply
    343.24x = 514.87 × 99.79
  4. Step 4: Simplify right side
    343.24x = 51,377.34
  5. Step 5: Solve for x
    x = 51,377.34/343.24
  6. Step 6: Final answer
    x = 149.68

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.