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Finding the Fourth Proportional to 571.72, 855.96 and 425.20

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Solution

The fourth proportional to 571.72, 855.96 and 425.20 is: 636.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    571.72 : 855.96 = 425.20 : x
  2. Step 2: Convert to fraction form
    571.72/855.96 = 425.20/x
  3. Step 3: Cross multiply
    571.72x = 855.96 × 425.20
  4. Step 4: Simplify right side
    571.72x = 363,954.19
  5. Step 5: Solve for x
    x = 363,954.19/571.72
  6. Step 6: Final answer
    x = 636.60

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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.