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Finding the Fourth Proportional to 878.26, 1,212.06 and 616.90

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Solution

The fourth proportional to 878.26, 1,212.06 and 616.90 is: 851.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    878.26 : 1,212.06 = 616.90 : x
  2. Step 2: Convert to fraction form
    878.26/1,212.06 = 616.90/x
  3. Step 3: Cross multiply
    878.26x = 1,212.06 × 616.90
  4. Step 4: Simplify right side
    878.26x = 747,719.81
  5. Step 5: Solve for x
    x = 747,719.81/878.26
  6. Step 6: Final answer
    x = 851.36

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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.