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Finding the Fourth Proportional to 102.85, 154.21 and 48.79

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Solution

The fourth proportional to 102.85, 154.21 and 48.79 is: 73.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.85 : 154.21 = 48.79 : x
  2. Step 2: Convert to fraction form
    102.85/154.21 = 48.79/x
  3. Step 3: Cross multiply
    102.85x = 154.21 × 48.79
  4. Step 4: Simplify right side
    102.85x = 7,523.66
  5. Step 5: Solve for x
    x = 7,523.66/102.85
  6. Step 6: Final answer
    x = 73.15

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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.