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Finding the Fourth Proportional to 311.16, 466.42 and 148.72

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Solution

The fourth proportional to 311.16, 466.42 and 148.72 is: 222.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.16 : 466.42 = 148.72 : x
  2. Step 2: Convert to fraction form
    311.16/466.42 = 148.72/x
  3. Step 3: Cross multiply
    311.16x = 466.42 × 148.72
  4. Step 4: Simplify right side
    311.16x = 69,365.98
  5. Step 5: Solve for x
    x = 69,365.98/311.16
  6. Step 6: Final answer
    x = 222.93

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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.