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Finding the Fourth Proportional to 102.55, 153.78 and 34.05

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Solution

The fourth proportional to 102.55, 153.78 and 34.05 is: 51.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.55 : 153.78 = 34.05 : x
  2. Step 2: Convert to fraction form
    102.55/153.78 = 34.05/x
  3. Step 3: Cross multiply
    102.55x = 153.78 × 34.05
  4. Step 4: Simplify right side
    102.55x = 5,236.21
  5. Step 5: Solve for x
    x = 5,236.21/102.55
  6. Step 6: Final answer
    x = 51.06

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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.