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Finding the Fourth Proportional to 1,066.75, 1,472.05 and 687.97

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Solution

The fourth proportional to 1,066.75, 1,472.05 and 687.97 is: 949.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,066.75 : 1,472.05 = 687.97 : x
  2. Step 2: Convert to fraction form
    1,066.75/1,472.05 = 687.97/x
  3. Step 3: Cross multiply
    1,066.75x = 1,472.05 × 687.97
  4. Step 4: Simplify right side
    1,066.75x = 1,012,726.24
  5. Step 5: Solve for x
    x = 1,012,726.24/1,066.75
  6. Step 6: Final answer
    x = 949.36

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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.