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Finding the Fourth Proportional to 202.17, 278.98 and 113.66

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Solution

The fourth proportional to 202.17, 278.98 and 113.66 is: 156.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    202.17 : 278.98 = 113.66 : x
  2. Step 2: Convert to fraction form
    202.17/278.98 = 113.66/x
  3. Step 3: Cross multiply
    202.17x = 278.98 × 113.66
  4. Step 4: Simplify right side
    202.17x = 31,708.87
  5. Step 5: Solve for x
    x = 31,708.87/202.17
  6. Step 6: Final answer
    x = 156.84

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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.