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Finding the Fourth Proportional to 311.04, 428.88 and 194.40

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Solution

The fourth proportional to 311.04, 428.88 and 194.40 is: 268.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.04 : 428.88 = 194.40 : x
  2. Step 2: Convert to fraction form
    311.04/428.88 = 194.40/x
  3. Step 3: Cross multiply
    311.04x = 428.88 × 194.40
  4. Step 4: Simplify right side
    311.04x = 83,374.27
  5. Step 5: Solve for x
    x = 83,374.27/311.04
  6. Step 6: Final answer
    x = 268.05

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.