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Finding the Fourth Proportional to 1,222.73, 1,687.41 and 698.75

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Solution

The fourth proportional to 1,222.73, 1,687.41 and 698.75 is: 964.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,222.73 : 1,687.41 = 698.75 : x
  2. Step 2: Convert to fraction form
    1,222.73/1,687.41 = 698.75/x
  3. Step 3: Cross multiply
    1,222.73x = 1,687.41 × 698.75
  4. Step 4: Simplify right side
    1,222.73x = 1,179,077.74
  5. Step 5: Solve for x
    x = 1,179,077.74/1,222.73
  6. Step 6: Final answer
    x = 964.30

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1.5x scale

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.