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Finding the Fourth Proportional to 312.64, 468.60 and 149.95

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Solution

The fourth proportional to 312.64, 468.60 and 149.95 is: 224.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.64 : 468.60 = 149.95 : x
  2. Step 2: Convert to fraction form
    312.64/468.60 = 149.95/x
  3. Step 3: Cross multiply
    312.64x = 468.60 × 149.95
  4. Step 4: Simplify right side
    312.64x = 70,266.57
  5. Step 5: Solve for x
    x = 70,266.57/312.64
  6. Step 6: Final answer
    x = 224.75

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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.