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Finding the Fourth Proportional to 427.28, 588.57 and 395.78

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Solution

The fourth proportional to 427.28, 588.57 and 395.78 is: 545.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.28 : 588.57 = 395.78 : x
  2. Step 2: Convert to fraction form
    427.28/588.57 = 395.78/x
  3. Step 3: Cross multiply
    427.28x = 588.57 × 395.78
  4. Step 4: Simplify right side
    427.28x = 232,944.23
  5. Step 5: Solve for x
    x = 232,944.23/427.28
  6. Step 6: Final answer
    x = 545.18

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.