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Finding the Fourth Proportional to 879.30, 1,305.95 and 863.10

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Solution

The fourth proportional to 879.30, 1,305.95 and 863.10 is: 1,281.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.30 : 1,305.95 = 863.10 : x
  2. Step 2: Convert to fraction form
    879.30/1,305.95 = 863.10/x
  3. Step 3: Cross multiply
    879.30x = 1,305.95 × 863.10
  4. Step 4: Simplify right side
    879.30x = 1,127,161.13
  5. Step 5: Solve for x
    x = 1,127,161.13/879.30
  6. Step 6: Final answer
    x = 1,281.88

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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.