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Finding the Fourth Proportional to 878.50, 1,212.32 and 480.18

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Solution

The fourth proportional to 878.50, 1,212.32 and 480.18 is: 662.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    878.50 : 1,212.32 = 480.18 : x
  2. Step 2: Convert to fraction form
    878.50/1,212.32 = 480.18/x
  3. Step 3: Cross multiply
    878.50x = 1,212.32 × 480.18
  4. Step 4: Simplify right side
    878.50x = 582,131.82
  5. Step 5: Solve for x
    x = 582,131.82/878.50
  6. Step 6: Final answer
    x = 662.64

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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.