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Finding the Fourth Proportional to 2.58, 3.86 and 1.86

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Solution

The fourth proportional to 2.58, 3.86 and 1.86 is: 2.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    2.58 : 3.86 = 1.86 : x
  2. Step 2: Convert to fraction form
    2.58/3.86 = 1.86/x
  3. Step 3: Cross multiply
    2.58x = 3.86 × 1.86
  4. Step 4: Simplify right side
    2.58x = 7.17
  5. Step 5: Solve for x
    x = 7.17/2.58
  6. Step 6: Final answer
    x = 2.78

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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.