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Finding the Fourth Proportional to 378.95, 568.42 and 118.94

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Solution

The fourth proportional to 378.95, 568.42 and 118.94 is: 178.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    378.95 : 568.42 = 118.94 : x
  2. Step 2: Convert to fraction form
    378.95/568.42 = 118.94/x
  3. Step 3: Cross multiply
    378.95x = 568.42 × 118.94
  4. Step 4: Simplify right side
    378.95x = 67,604.74
  5. Step 5: Solve for x
    x = 67,604.74/378.95
  6. Step 6: Final answer
    x = 178.40

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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.