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Finding the Fourth Proportional to 2.92, 4 and 2.85

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Solution

The fourth proportional to 2.92, 4 and 2.85 is: 3.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    2.92 : 4 = 2.85 : x
  2. Step 2: Convert to fraction form
    2.92/4 = 2.85/x
  3. Step 3: Cross multiply
    2.92x = 4 × 2.85
  4. Step 4: Simplify right side
    2.92x = 11.40
  5. Step 5: Solve for x
    x = 11.40/2.92
  6. Step 6: Final answer
    x = 3.90

Related Problems

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.