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Finding the Fourth Proportional to 1,275.43, 1,911.78 and 658.97

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Solution

The fourth proportional to 1,275.43, 1,911.78 and 658.97 is: 987.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,275.43 : 1,911.78 = 658.97 : x
  2. Step 2: Convert to fraction form
    1,275.43/1,911.78 = 658.97/x
  3. Step 3: Cross multiply
    1,275.43x = 1,911.78 × 658.97
  4. Step 4: Simplify right side
    1,275.43x = 1,259,805.67
  5. Step 5: Solve for x
    x = 1,259,805.67/1,275.43
  6. Step 6: Final answer
    x = 987.75

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