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Finding the Fourth Proportional to 1.74, 2.39 and 1.38

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Solution

The fourth proportional to 1.74, 2.39 and 1.38 is: 1.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1.74 : 2.39 = 1.38 : x
  2. Step 2: Convert to fraction form
    1.74/2.39 = 1.38/x
  3. Step 3: Cross multiply
    1.74x = 2.39 × 1.38
  4. Step 4: Simplify right side
    1.74x = 3.29
  5. Step 5: Solve for x
    x = 3.29/1.74
  6. Step 6: Final answer
    x = 1.89

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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.