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Finding the Fourth Proportional to 135.17, 202.79 and 77.46

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Solution

The fourth proportional to 135.17, 202.79 and 77.46 is: 116.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    135.17 : 202.79 = 77.46 : x
  2. Step 2: Convert to fraction form
    135.17/202.79 = 77.46/x
  3. Step 3: Cross multiply
    135.17x = 202.79 × 77.46
  4. Step 4: Simplify right side
    135.17x = 15,708.11
  5. Step 5: Solve for x
    x = 15,708.11/135.17
  6. Step 6: Final answer
    x = 116.21

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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.