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Finding the Fourth Proportional to 208.77, 288.12 and 138.93

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Solution

The fourth proportional to 208.77, 288.12 and 138.93 is: 191.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.77 : 288.12 = 138.93 : x
  2. Step 2: Convert to fraction form
    208.77/288.12 = 138.93/x
  3. Step 3: Cross multiply
    208.77x = 288.12 × 138.93
  4. Step 4: Simplify right side
    208.77x = 40,028.51
  5. Step 5: Solve for x
    x = 40,028.51/208.77
  6. Step 6: Final answer
    x = 191.73

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.