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Finding the Fourth Proportional to 3.98, 6 and 3.91

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Solution

The fourth proportional to 3.98, 6 and 3.91 is: 5.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    3.98 : 6 = 3.91 : x
  2. Step 2: Convert to fraction form
    3.98/6 = 3.91/x
  3. Step 3: Cross multiply
    3.98x = 6 × 3.91
  4. Step 4: Simplify right side
    3.98x = 23.46
  5. Step 5: Solve for x
    x = 23.46/3.98
  6. Step 6: Final answer
    x = 5.89

Related Problems

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.