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Finding the Fourth Proportional to 1,222.97, 1,687.97 and 956.89

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Solution

The fourth proportional to 1,222.97, 1,687.97 and 956.89 is: 1,320.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,222.97 : 1,687.97 = 956.89 : x
  2. Step 2: Convert to fraction form
    1,222.97/1,687.97 = 956.89/x
  3. Step 3: Cross multiply
    1,222.97x = 1,687.97 × 956.89
  4. Step 4: Simplify right side
    1,222.97x = 1,615,195.57
  5. Step 5: Solve for x
    x = 1,615,195.57/1,222.97
  6. Step 6: Final answer
    x = 1,320.72

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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.