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Finding the Fourth Proportional to 113.55, 171 and 102.84

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Solution

The fourth proportional to 113.55, 171 and 102.84 is: 154.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.55 : 171 = 102.84 : x
  2. Step 2: Convert to fraction form
    113.55/171 = 102.84/x
  3. Step 3: Cross multiply
    113.55x = 171 × 102.84
  4. Step 4: Simplify right side
    113.55x = 17,585.64
  5. Step 5: Solve for x
    x = 17,585.64/113.55
  6. Step 6: Final answer
    x = 154.87

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.