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Finding the Fourth Proportional to 139.48, 208.94 and 102.90

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Solution

The fourth proportional to 139.48, 208.94 and 102.90 is: 154.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.48 : 208.94 = 102.90 : x
  2. Step 2: Convert to fraction form
    139.48/208.94 = 102.90/x
  3. Step 3: Cross multiply
    139.48x = 208.94 × 102.90
  4. Step 4: Simplify right side
    139.48x = 21,499.93
  5. Step 5: Solve for x
    x = 21,499.93/139.48
  6. Step 6: Final answer
    x = 154.14

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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.