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Finding the Fourth Proportional to 1,213.73, 1,674.94 and 689.76

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Solution

The fourth proportional to 1,213.73, 1,674.94 and 689.76 is: 951.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,213.73 : 1,674.94 = 689.76 : x
  2. Step 2: Convert to fraction form
    1,213.73/1,674.94 = 689.76/x
  3. Step 3: Cross multiply
    1,213.73x = 1,674.94 × 689.76
  4. Step 4: Simplify right side
    1,213.73x = 1,155,306.61
  5. Step 5: Solve for x
    x = 1,155,306.61/1,213.73
  6. Step 6: Final answer
    x = 951.87

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.