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Finding the Fourth Proportional to 1,306.52, 1,960.31 and 690.76

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Solution

The fourth proportional to 1,306.52, 1,960.31 and 690.76 is: 1,036.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,306.52 : 1,960.31 = 690.76 : x
  2. Step 2: Convert to fraction form
    1,306.52/1,960.31 = 690.76/x
  3. Step 3: Cross multiply
    1,306.52x = 1,960.31 × 690.76
  4. Step 4: Simplify right side
    1,306.52x = 1,354,103.74
  5. Step 5: Solve for x
    x = 1,354,103.74/1,306.52
  6. Step 6: Final answer
    x = 1,036.42

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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.