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Finding the Fourth Proportional to 139.60, 208.21 and 135.75

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Solution

The fourth proportional to 139.60, 208.21 and 135.75 is: 202.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.60 : 208.21 = 135.75 : x
  2. Step 2: Convert to fraction form
    139.60/208.21 = 135.75/x
  3. Step 3: Cross multiply
    139.60x = 208.21 × 135.75
  4. Step 4: Simplify right side
    139.60x = 28,264.17
  5. Step 5: Solve for x
    x = 28,264.17/139.60
  6. Step 6: Final answer
    x = 202.47

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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.