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Finding the Fourth Proportional to 292.50, 438.11 and 138.20

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Solution

The fourth proportional to 292.50, 438.11 and 138.20 is: 206.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    292.50 : 438.11 = 138.20 : x
  2. Step 2: Convert to fraction form
    292.50/438.11 = 138.20/x
  3. Step 3: Cross multiply
    292.50x = 438.11 × 138.20
  4. Step 4: Simplify right side
    292.50x = 60,544.96
  5. Step 5: Solve for x
    x = 60,544.96/292.50
  6. Step 6: Final answer
    x = 206.99

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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.