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Finding the Fourth Proportional to 102.70, 154.08 and 47.85

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Solution

The fourth proportional to 102.70, 154.08 and 47.85 is: 71.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.70 : 154.08 = 47.85 : x
  2. Step 2: Convert to fraction form
    102.70/154.08 = 47.85/x
  3. Step 3: Cross multiply
    102.70x = 154.08 × 47.85
  4. Step 4: Simplify right side
    102.70x = 7,371.96
  5. Step 5: Solve for x
    x = 7,371.96/102.70
  6. Step 6: Final answer
    x = 71.78

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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.