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Finding the Fourth Proportional to 378.99, 568.33 and 118.90

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Solution

The fourth proportional to 378.99, 568.33 and 118.90 is: 178.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    378.99 : 568.33 = 118.90 : x
  2. Step 2: Convert to fraction form
    378.99/568.33 = 118.90/x
  3. Step 3: Cross multiply
    378.99x = 568.33 × 118.90
  4. Step 4: Simplify right side
    378.99x = 67,573.84
  5. Step 5: Solve for x
    x = 67,573.84/378.99
  6. Step 6: Final answer
    x = 178.30

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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.