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Finding the Fourth Proportional to 992.70, 1,489.11 and 343.35

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Solution

The fourth proportional to 992.70, 1,489.11 and 343.35 is: 515.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    992.70 : 1,489.11 = 343.35 : x
  2. Step 2: Convert to fraction form
    992.70/1,489.11 = 343.35/x
  3. Step 3: Cross multiply
    992.70x = 1,489.11 × 343.35
  4. Step 4: Simplify right side
    992.70x = 511,285.92
  5. Step 5: Solve for x
    x = 511,285.92/992.70
  6. Step 6: Final answer
    x = 515.05

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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.