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Finding the Fourth Proportional to 644.32, 959.60 and 611.20

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Solution

The fourth proportional to 644.32, 959.60 and 611.20 is: 910.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.32 : 959.60 = 611.20 : x
  2. Step 2: Convert to fraction form
    644.32/959.60 = 611.20/x
  3. Step 3: Cross multiply
    644.32x = 959.60 × 611.20
  4. Step 4: Simplify right side
    644.32x = 586,507.52
  5. Step 5: Solve for x
    x = 586,507.52/644.32
  6. Step 6: Final answer
    x = 910.27

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.