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Finding the Fourth Proportional to 139.51, 208.77 and 102.86

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Solution

The fourth proportional to 139.51, 208.77 and 102.86 is: 153.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.51 : 208.77 = 102.86 : x
  2. Step 2: Convert to fraction form
    139.51/208.77 = 102.86/x
  3. Step 3: Cross multiply
    139.51x = 208.77 × 102.86
  4. Step 4: Simplify right side
    139.51x = 21,473.95
  5. Step 5: Solve for x
    x = 21,473.95/139.51
  6. Step 6: Final answer
    x = 153.93

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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.