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Finding the Fourth Proportional to 1.81, 2.51 and 1.61

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Solution

The fourth proportional to 1.81, 2.51 and 1.61 is: 2.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1.81 : 2.51 = 1.61 : x
  2. Step 2: Convert to fraction form
    1.81/2.51 = 1.61/x
  3. Step 3: Cross multiply
    1.81x = 2.51 × 1.61
  4. Step 4: Simplify right side
    1.81x = 4.04
  5. Step 5: Solve for x
    x = 4.04/1.81
  6. Step 6: Final answer
    x = 2.23

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.