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Finding the Fourth Proportional to 378.42, 567.61 and 215.75

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Solution

The fourth proportional to 378.42, 567.61 and 215.75 is: 323.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    378.42 : 567.61 = 215.75 : x
  2. Step 2: Convert to fraction form
    378.42/567.61 = 215.75/x
  3. Step 3: Cross multiply
    378.42x = 567.61 × 215.75
  4. Step 4: Simplify right side
    378.42x = 122,461.86
  5. Step 5: Solve for x
    x = 122,461.86/378.42
  6. Step 6: Final answer
    x = 323.61

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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.