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Finding the Fourth Proportional to 1,222.46, 1,687.11 and 698.54

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Solution

The fourth proportional to 1,222.46, 1,687.11 and 698.54 is: 964.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,222.46 : 1,687.11 = 698.54 : x
  2. Step 2: Convert to fraction form
    1,222.46/1,687.11 = 698.54/x
  3. Step 3: Cross multiply
    1,222.46x = 1,687.11 × 698.54
  4. Step 4: Simplify right side
    1,222.46x = 1,178,513.82
  5. Step 5: Solve for x
    x = 1,178,513.82/1,222.46
  6. Step 6: Final answer
    x = 964.05

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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.