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Finding the Fourth Proportional to 878, 1,317 and 270

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Solution

The fourth proportional to 878, 1,317 and 270 is: 405

Step by Step Solution

  1. Step 1: Write the proportion equation
    878 : 1,317 = 270 : x
  2. Step 2: Convert to fraction form
    878/1,317 = 270/x
  3. Step 3: Cross multiply
    878x = 1,317 × 270
  4. Step 4: Simplify right side
    878x = 355,590
  5. Step 5: Solve for x
    x = 355,590/878
  6. Step 6: Final answer
    x = 405

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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.