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Finding the Fourth Proportional to 292.95, 439.22 and 138.85

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Solution

The fourth proportional to 292.95, 439.22 and 138.85 is: 208.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    292.95 : 439.22 = 138.85 : x
  2. Step 2: Convert to fraction form
    292.95/439.22 = 138.85/x
  3. Step 3: Cross multiply
    292.95x = 439.22 × 138.85
  4. Step 4: Simplify right side
    292.95x = 60,984.95
  5. Step 5: Solve for x
    x = 60,984.95/292.95
  6. Step 6: Final answer
    x = 208.18

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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.