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Finding the Fourth Proportional to 1,227.20, 1,691.76 and 877.28

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Solution

The fourth proportional to 1,227.20, 1,691.76 and 877.28 is: 1,209.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,227.20 : 1,691.76 = 877.28 : x
  2. Step 2: Convert to fraction form
    1,227.20/1,691.76 = 877.28/x
  3. Step 3: Cross multiply
    1,227.20x = 1,691.76 × 877.28
  4. Step 4: Simplify right side
    1,227.20x = 1,484,138.75
  5. Step 5: Solve for x
    x = 1,484,138.75/1,227.20
  6. Step 6: Final answer
    x = 1,209.37

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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.