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Finding the Fourth Proportional to 292.12, 438.32 and 138.12

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Solution

The fourth proportional to 292.12, 438.32 and 138.12 is: 207.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    292.12 : 438.32 = 138.12 : x
  2. Step 2: Convert to fraction form
    292.12/438.32 = 138.12/x
  3. Step 3: Cross multiply
    292.12x = 438.32 × 138.12
  4. Step 4: Simplify right side
    292.12x = 60,540.76
  5. Step 5: Solve for x
    x = 60,540.76/292.12
  6. Step 6: Final answer
    x = 207.25

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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.