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Finding the Fourth Proportional to 878.10, 1,220.15 and 867.66

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Solution

The fourth proportional to 878.10, 1,220.15 and 867.66 is: 1,205.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    878.10 : 1,220.15 = 867.66 : x
  2. Step 2: Convert to fraction form
    878.10/1,220.15 = 867.66/x
  3. Step 3: Cross multiply
    878.10x = 1,220.15 × 867.66
  4. Step 4: Simplify right side
    878.10x = 1,058,671.01
  5. Step 5: Solve for x
    x = 1,058,671.01/878.10
  6. Step 6: Final answer
    x = 1,205.64

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.