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Finding the Fourth Proportional to 2.43, 3.65 and 1.31

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Solution

The fourth proportional to 2.43, 3.65 and 1.31 is: 1.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    2.43 : 3.65 = 1.31 : x
  2. Step 2: Convert to fraction form
    2.43/3.65 = 1.31/x
  3. Step 3: Cross multiply
    2.43x = 3.65 × 1.31
  4. Step 4: Simplify right side
    2.43x = 4.77
  5. Step 5: Solve for x
    x = 4.77/2.43
  6. Step 6: Final answer
    x = 1.96

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.