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Finding the Fourth Proportional to 378.90, 568.35 and 147.69

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Solution

The fourth proportional to 378.90, 568.35 and 147.69 is: 221.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    378.90 : 568.35 = 147.69 : x
  2. Step 2: Convert to fraction form
    378.90/568.35 = 147.69/x
  3. Step 3: Cross multiply
    378.90x = 568.35 × 147.69
  4. Step 4: Simplify right side
    378.90x = 83,939.61
  5. Step 5: Solve for x
    x = 83,939.61/378.90
  6. Step 6: Final answer
    x = 221.54

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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.