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Finding the Fourth Proportional to 878.36, 1,212.13 and 480.02

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Solution

The fourth proportional to 878.36, 1,212.13 and 480.02 is: 662.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    878.36 : 1,212.13 = 480.02 : x
  2. Step 2: Convert to fraction form
    878.36/1,212.13 = 480.02/x
  3. Step 3: Cross multiply
    878.36x = 1,212.13 × 480.02
  4. Step 4: Simplify right side
    878.36x = 581,838.18
  5. Step 5: Solve for x
    x = 581,838.18/878.36
  6. Step 6: Final answer
    x = 662.41

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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.