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Finding the Fourth Proportional to 311.90, 468.08 and 149.70

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Solution

The fourth proportional to 311.90, 468.08 and 149.70 is: 224.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.90 : 468.08 = 149.70 : x
  2. Step 2: Convert to fraction form
    311.90/468.08 = 149.70/x
  3. Step 3: Cross multiply
    311.90x = 468.08 × 149.70
  4. Step 4: Simplify right side
    311.90x = 70,071.58
  5. Step 5: Solve for x
    x = 70,071.58/311.90
  6. Step 6: Final answer
    x = 224.66

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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.