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Finding the Fourth Proportional to 1,082.84, 1,493.78 and 861.30

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Solution

The fourth proportional to 1,082.84, 1,493.78 and 861.30 is: 1,188.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,082.84 : 1,493.78 = 861.30 : x
  2. Step 2: Convert to fraction form
    1,082.84/1,493.78 = 861.30/x
  3. Step 3: Cross multiply
    1,082.84x = 1,493.78 × 861.30
  4. Step 4: Simplify right side
    1,082.84x = 1,286,588.41
  5. Step 5: Solve for x
    x = 1,286,588.41/1,082.84
  6. Step 6: Final answer
    x = 1,188.17

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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.