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Finding the Fourth Proportional to 1,306.76, 1,960.07 and 648.38

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Solution

The fourth proportional to 1,306.76, 1,960.07 and 648.38 is: 972.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,306.76 : 1,960.07 = 648.38 : x
  2. Step 2: Convert to fraction form
    1,306.76/1,960.07 = 648.38/x
  3. Step 3: Cross multiply
    1,306.76x = 1,960.07 × 648.38
  4. Step 4: Simplify right side
    1,306.76x = 1,270,871.80
  5. Step 5: Solve for x
    x = 1,270,871.80/1,306.76
  6. Step 6: Final answer
    x = 972.54

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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.