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Finding the Fourth Proportional to 312.32, 468.12 and 138.95

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Solution

The fourth proportional to 312.32, 468.12 and 138.95 is: 208.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.32 : 468.12 = 138.95 : x
  2. Step 2: Convert to fraction form
    312.32/468.12 = 138.95/x
  3. Step 3: Cross multiply
    312.32x = 468.12 × 138.95
  4. Step 4: Simplify right side
    312.32x = 65,042.93
  5. Step 5: Solve for x
    x = 65,042.93/312.32
  6. Step 6: Final answer
    x = 208.26

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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.