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Finding the Fourth Proportional to 1,222.71, 1,687.19 and 691.52

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Solution

The fourth proportional to 1,222.71, 1,687.19 and 691.52 is: 954.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,222.71 : 1,687.19 = 691.52 : x
  2. Step 2: Convert to fraction form
    1,222.71/1,687.19 = 691.52/x
  3. Step 3: Cross multiply
    1,222.71x = 1,687.19 × 691.52
  4. Step 4: Simplify right side
    1,222.71x = 1,166,731.58
  5. Step 5: Solve for x
    x = 1,166,731.58/1,222.71
  6. Step 6: Final answer
    x = 954.22

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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.