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Finding the Fourth Proportional to 102.70, 154.06 and 30.56

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Solution

The fourth proportional to 102.70, 154.06 and 30.56 is: 45.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.70 : 154.06 = 30.56 : x
  2. Step 2: Convert to fraction form
    102.70/154.06 = 30.56/x
  3. Step 3: Cross multiply
    102.70x = 154.06 × 30.56
  4. Step 4: Simplify right side
    102.70x = 4,708.38
  5. Step 5: Solve for x
    x = 4,708.38/102.70
  6. Step 6: Final answer
    x = 45.85

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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.