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Finding the Fourth Proportional to 571.28, 855.74 and 425.18

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Solution

The fourth proportional to 571.28, 855.74 and 425.18 is: 636.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    571.28 : 855.74 = 425.18 : x
  2. Step 2: Convert to fraction form
    571.28/855.74 = 425.18/x
  3. Step 3: Cross multiply
    571.28x = 855.74 × 425.18
  4. Step 4: Simplify right side
    571.28x = 363,837.13
  5. Step 5: Solve for x
    x = 363,837.13/571.28
  6. Step 6: Final answer
    x = 636.89

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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.