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Finding the Fourth Proportional to 872.56, 1,311.28 and 440

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Solution

The fourth proportional to 872.56, 1,311.28 and 440 is: 661.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.56 : 1,311.28 = 440 : x
  2. Step 2: Convert to fraction form
    872.56/1,311.28 = 440/x
  3. Step 3: Cross multiply
    872.56x = 1,311.28 × 440
  4. Step 4: Simplify right side
    872.56x = 576,963.20
  5. Step 5: Solve for x
    x = 576,963.20/872.56
  6. Step 6: Final answer
    x = 661.23

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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.