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Finding the Fourth Proportional to 878.69, 1,318.03 and 262.40

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Solution

The fourth proportional to 878.69, 1,318.03 and 262.40 is: 393.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    878.69 : 1,318.03 = 262.40 : x
  2. Step 2: Convert to fraction form
    878.69/1,318.03 = 262.40/x
  3. Step 3: Cross multiply
    878.69x = 1,318.03 × 262.40
  4. Step 4: Simplify right side
    878.69x = 345,849.76
  5. Step 5: Solve for x
    x = 345,849.76/878.69
  6. Step 6: Final answer
    x = 393.60

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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.