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Finding the Fourth Proportional to 138.88, 206.88 and 138.24

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Solution

The fourth proportional to 138.88, 206.88 and 138.24 is: 205.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.88 : 206.88 = 138.24 : x
  2. Step 2: Convert to fraction form
    138.88/206.88 = 138.24/x
  3. Step 3: Cross multiply
    138.88x = 206.88 × 138.24
  4. Step 4: Simplify right side
    138.88x = 28,599.09
  5. Step 5: Solve for x
    x = 28,599.09/138.88
  6. Step 6: Final answer
    x = 205.93

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.