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Finding the Fourth Proportional to 4.85, 7.28 and 1.85

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Solution

The fourth proportional to 4.85, 7.28 and 1.85 is: 2.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    4.85 : 7.28 = 1.85 : x
  2. Step 2: Convert to fraction form
    4.85/7.28 = 1.85/x
  3. Step 3: Cross multiply
    4.85x = 7.28 × 1.85
  4. Step 4: Simplify right side
    4.85x = 13.42
  5. Step 5: Solve for x
    x = 13.42/4.85
  6. Step 6: Final answer
    x = 2.77

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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.