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Finding the Fourth Proportional to 343.42, 515.15 and 99.97

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Solution

The fourth proportional to 343.42, 515.15 and 99.97 is: 149.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    343.42 : 515.15 = 99.97 : x
  2. Step 2: Convert to fraction form
    343.42/515.15 = 99.97/x
  3. Step 3: Cross multiply
    343.42x = 515.15 × 99.97
  4. Step 4: Simplify right side
    343.42x = 51,496.47
  5. Step 5: Solve for x
    x = 51,496.47/343.42
  6. Step 6: Final answer
    x = 149.95

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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.