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Finding the Fourth Proportional to 1,222.71, 1,687.26 and 698.74

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Solution

The fourth proportional to 1,222.71, 1,687.26 and 698.74 is: 964.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,222.71 : 1,687.26 = 698.74 : x
  2. Step 2: Convert to fraction form
    1,222.71/1,687.26 = 698.74/x
  3. Step 3: Cross multiply
    1,222.71x = 1,687.26 × 698.74
  4. Step 4: Simplify right side
    1,222.71x = 1,178,954.45
  5. Step 5: Solve for x
    x = 1,178,954.45/1,222.71
  6. Step 6: Final answer
    x = 964.22

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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.