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Finding the Fourth Proportional to 139.04, 209.36 and 135.68

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Solution

The fourth proportional to 139.04, 209.36 and 135.68 is: 204.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.04 : 209.36 = 135.68 : x
  2. Step 2: Convert to fraction form
    139.04/209.36 = 135.68/x
  3. Step 3: Cross multiply
    139.04x = 209.36 × 135.68
  4. Step 4: Simplify right side
    139.04x = 28,405.96
  5. Step 5: Solve for x
    x = 28,405.96/139.04
  6. Step 6: Final answer
    x = 204.30

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.