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Finding the Fourth Proportional to 139.17, 208.73 and 52.50

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Solution

The fourth proportional to 139.17, 208.73 and 52.50 is: 78.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.17 : 208.73 = 52.50 : x
  2. Step 2: Convert to fraction form
    139.17/208.73 = 52.50/x
  3. Step 3: Cross multiply
    139.17x = 208.73 × 52.50
  4. Step 4: Simplify right side
    139.17x = 10,958.06
  5. Step 5: Solve for x
    x = 10,958.06/139.17
  6. Step 6: Final answer
    x = 78.74

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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.