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Finding the Fourth Proportional to 139.24, 208.56 and 138.32

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Solution

The fourth proportional to 139.24, 208.56 and 138.32 is: 207.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.24 : 208.56 = 138.32 : x
  2. Step 2: Convert to fraction form
    139.24/208.56 = 138.32/x
  3. Step 3: Cross multiply
    139.24x = 208.56 × 138.32
  4. Step 4: Simplify right side
    139.24x = 28,848.02
  5. Step 5: Solve for x
    x = 28,848.02/139.24
  6. Step 6: Final answer
    x = 207.18

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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.