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Finding the Fourth Proportional to 381.18, 572 and 198.70

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Solution

The fourth proportional to 381.18, 572 and 198.70 is: 298.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.18 : 572 = 198.70 : x
  2. Step 2: Convert to fraction form
    381.18/572 = 198.70/x
  3. Step 3: Cross multiply
    381.18x = 572 × 198.70
  4. Step 4: Simplify right side
    381.18x = 113,656.40
  5. Step 5: Solve for x
    x = 113,656.40/381.18
  6. Step 6: Final answer
    x = 298.17

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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.