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Finding the Fourth Proportional to 343.29, 514.95 and 99.81

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Solution

The fourth proportional to 343.29, 514.95 and 99.81 is: 149.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    343.29 : 514.95 = 99.81 : x
  2. Step 2: Convert to fraction form
    343.29/514.95 = 99.81/x
  3. Step 3: Cross multiply
    343.29x = 514.95 × 99.81
  4. Step 4: Simplify right side
    343.29x = 51,397.16
  5. Step 5: Solve for x
    x = 51,397.16/343.29
  6. Step 6: Final answer
    x = 149.72

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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.