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Finding the Fourth Proportional to 139.24, 208.90 and 52.60

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Solution

The fourth proportional to 139.24, 208.90 and 52.60 is: 78.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.24 : 208.90 = 52.60 : x
  2. Step 2: Convert to fraction form
    139.24/208.90 = 52.60/x
  3. Step 3: Cross multiply
    139.24x = 208.90 × 52.60
  4. Step 4: Simplify right side
    139.24x = 10,988.14
  5. Step 5: Solve for x
    x = 10,988.14/139.24
  6. Step 6: Final answer
    x = 78.92

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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.