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Finding the Fourth Proportional to 1,211.54, 1,672.08 and 687.74

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Solution

The fourth proportional to 1,211.54, 1,672.08 and 687.74 is: 949.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.54 : 1,672.08 = 687.74 : x
  2. Step 2: Convert to fraction form
    1,211.54/1,672.08 = 687.74/x
  3. Step 3: Cross multiply
    1,211.54x = 1,672.08 × 687.74
  4. Step 4: Simplify right side
    1,211.54x = 1,149,956.30
  5. Step 5: Solve for x
    x = 1,149,956.30/1,211.54
  6. Step 6: Final answer
    x = 949.17

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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.