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Finding the Fourth Proportional to 427.86, 642.08 and 252.38

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Solution

The fourth proportional to 427.86, 642.08 and 252.38 is: 378.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.86 : 642.08 = 252.38 : x
  2. Step 2: Convert to fraction form
    427.86/642.08 = 252.38/x
  3. Step 3: Cross multiply
    427.86x = 642.08 × 252.38
  4. Step 4: Simplify right side
    427.86x = 162,050.39
  5. Step 5: Solve for x
    x = 162,050.39/427.86
  6. Step 6: Final answer
    x = 378.75

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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.