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Finding the Fourth Proportional to 1.55, 2.31 and 1.49

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Solution

The fourth proportional to 1.55, 2.31 and 1.49 is: 2.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1.55 : 2.31 = 1.49 : x
  2. Step 2: Convert to fraction form
    1.55/2.31 = 1.49/x
  3. Step 3: Cross multiply
    1.55x = 2.31 × 1.49
  4. Step 4: Simplify right side
    1.55x = 3.42
  5. Step 5: Solve for x
    x = 3.42/1.55
  6. Step 6: Final answer
    x = 2.21

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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.