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Finding the Fourth Proportional to 1.42, 2.11 and 1.15

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Solution

The fourth proportional to 1.42, 2.11 and 1.15 is: 1.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1.42 : 2.11 = 1.15 : x
  2. Step 2: Convert to fraction form
    1.42/2.11 = 1.15/x
  3. Step 3: Cross multiply
    1.42x = 2.11 × 1.15
  4. Step 4: Simplify right side
    1.42x = 2.43
  5. Step 5: Solve for x
    x = 2.43/1.42
  6. Step 6: Final answer
    x = 1.71

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.