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Finding the Fourth Proportional to 1,211.28, 1,671.69 and 687.25

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Solution

The fourth proportional to 1,211.28, 1,671.69 and 687.25 is: 948.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.28 : 1,671.69 = 687.25 : x
  2. Step 2: Convert to fraction form
    1,211.28/1,671.69 = 687.25/x
  3. Step 3: Cross multiply
    1,211.28x = 1,671.69 × 687.25
  4. Step 4: Simplify right side
    1,211.28x = 1,148,868.95
  5. Step 5: Solve for x
    x = 1,148,868.95/1,211.28
  6. Step 6: Final answer
    x = 948.48

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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.