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Finding the Fourth Proportional to 640.44, 955.67 and 571.49

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Solution

The fourth proportional to 640.44, 955.67 and 571.49 is: 852.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.44 : 955.67 = 571.49 : x
  2. Step 2: Convert to fraction form
    640.44/955.67 = 571.49/x
  3. Step 3: Cross multiply
    640.44x = 955.67 × 571.49
  4. Step 4: Simplify right side
    640.44x = 546,155.85
  5. Step 5: Solve for x
    x = 546,155.85/640.44
  6. Step 6: Final answer
    x = 852.78

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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.