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Finding the Fourth Proportional to 928, 1,383.80 and 861.04

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Solution

The fourth proportional to 928, 1,383.80 and 861.04 is: 1,283.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    928 : 1,383.80 = 861.04 : x
  2. Step 2: Convert to fraction form
    928/1,383.80 = 861.04/x
  3. Step 3: Cross multiply
    928x = 1,383.80 × 861.04
  4. Step 4: Simplify right side
    928x = 1,191,507.15
  5. Step 5: Solve for x
    x = 1,191,507.15/928
  6. Step 6: Final answer
    x = 1,283.95

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.