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Finding the Fourth Proportional to 139.88, 208.33 and 139.07

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Solution

The fourth proportional to 139.88, 208.33 and 139.07 is: 207.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.88 : 208.33 = 139.07 : x
  2. Step 2: Convert to fraction form
    139.88/208.33 = 139.07/x
  3. Step 3: Cross multiply
    139.88x = 208.33 × 139.07
  4. Step 4: Simplify right side
    139.88x = 28,972.45
  5. Step 5: Solve for x
    x = 28,972.45/139.88
  6. Step 6: Final answer
    x = 207.12

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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.