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Finding the Fourth Proportional to 311.16, 430.56 and 272.46

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Solution

The fourth proportional to 311.16, 430.56 and 272.46 is: 377.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.16 : 430.56 = 272.46 : x
  2. Step 2: Convert to fraction form
    311.16/430.56 = 272.46/x
  3. Step 3: Cross multiply
    311.16x = 430.56 × 272.46
  4. Step 4: Simplify right side
    311.16x = 117,310.38
  5. Step 5: Solve for x
    x = 117,310.38/311.16
  6. Step 6: Final answer
    x = 377.01

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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.