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Finding the Fourth Proportional to 292.40, 438.21 and 138.11

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Solution

The fourth proportional to 292.40, 438.21 and 138.11 is: 206.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    292.40 : 438.21 = 138.11 : x
  2. Step 2: Convert to fraction form
    292.40/438.21 = 138.11/x
  3. Step 3: Cross multiply
    292.40x = 438.21 × 138.11
  4. Step 4: Simplify right side
    292.40x = 60,522.28
  5. Step 5: Solve for x
    x = 60,522.28/292.40
  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.