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Finding the Fourth Proportional to 202.17, 278.82 and 136.77

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Solution

The fourth proportional to 202.17, 278.82 and 136.77 is: 188.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    202.17 : 278.82 = 136.77 : x
  2. Step 2: Convert to fraction form
    202.17/278.82 = 136.77/x
  3. Step 3: Cross multiply
    202.17x = 278.82 × 136.77
  4. Step 4: Simplify right side
    202.17x = 38,132.82
  5. Step 5: Solve for x
    x = 38,132.82/202.17
  6. Step 6: Final answer
    x = 188.62

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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.