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Finding the Fourth Proportional to 992.90, 1,488.40 and 343.46

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Solution

The fourth proportional to 992.90, 1,488.40 and 343.46 is: 514.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    992.90 : 1,488.40 = 343.46 : x
  2. Step 2: Convert to fraction form
    992.90/1,488.40 = 343.46/x
  3. Step 3: Cross multiply
    992.90x = 1,488.40 × 343.46
  4. Step 4: Simplify right side
    992.90x = 511,205.86
  5. Step 5: Solve for x
    x = 511,205.86/992.90
  6. Step 6: Final answer
    x = 514.86

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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.