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Finding the Fourth Proportional to 139.32, 208.84 and 103.20

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Solution

The fourth proportional to 139.32, 208.84 and 103.20 is: 154.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.32 : 208.84 = 103.20 : x
  2. Step 2: Convert to fraction form
    139.32/208.84 = 103.20/x
  3. Step 3: Cross multiply
    139.32x = 208.84 × 103.20
  4. Step 4: Simplify right side
    139.32x = 21,552.29
  5. Step 5: Solve for x
    x = 21,552.29/139.32
  6. Step 6: Final answer
    x = 154.70

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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.