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Finding the Fourth Proportional to 878.74, 1,212.63 and 579.62

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Solution

The fourth proportional to 878.74, 1,212.63 and 579.62 is: 799.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    878.74 : 1,212.63 = 579.62 : x
  2. Step 2: Convert to fraction form
    878.74/1,212.63 = 579.62/x
  3. Step 3: Cross multiply
    878.74x = 1,212.63 × 579.62
  4. Step 4: Simplify right side
    878.74x = 702,864.60
  5. Step 5: Solve for x
    x = 702,864.60/878.74
  6. Step 6: Final answer
    x = 799.86

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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.