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Finding the Fourth Proportional to 878.78, 1,318.10 and 262.49

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Solution

The fourth proportional to 878.78, 1,318.10 and 262.49 is: 393.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    878.78 : 1,318.10 = 262.49 : x
  2. Step 2: Convert to fraction form
    878.78/1,318.10 = 262.49/x
  3. Step 3: Cross multiply
    878.78x = 1,318.10 × 262.49
  4. Step 4: Simplify right side
    878.78x = 345,980.17
  5. Step 5: Solve for x
    x = 345,980.17/878.78
  6. Step 6: Final answer
    x = 393.70

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.