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Finding the Fourth Proportional to 2.29, 3.16 and 1.91

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Solution

The fourth proportional to 2.29, 3.16 and 1.91 is: 2.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    2.29 : 3.16 = 1.91 : x
  2. Step 2: Convert to fraction form
    2.29/3.16 = 1.91/x
  3. Step 3: Cross multiply
    2.29x = 3.16 × 1.91
  4. Step 4: Simplify right side
    2.29x = 6.04
  5. Step 5: Solve for x
    x = 6.04/2.29
  6. Step 6: Final answer
    x = 2.64

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.