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Finding the Fourth Proportional to 878.58, 1,212.48 and 616.68

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Solution

The fourth proportional to 878.58, 1,212.48 and 616.68 is: 851.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    878.58 : 1,212.48 = 616.68 : x
  2. Step 2: Convert to fraction form
    878.58/1,212.48 = 616.68/x
  3. Step 3: Cross multiply
    878.58x = 1,212.48 × 616.68
  4. Step 4: Simplify right side
    878.58x = 747,712.17
  5. Step 5: Solve for x
    x = 747,712.17/878.58
  6. Step 6: Final answer
    x = 851.05

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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.