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Finding the Fourth Proportional to 4.58, 6.87 and 1.91

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Solution

The fourth proportional to 4.58, 6.87 and 1.91 is: 2.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    4.58 : 6.87 = 1.91 : x
  2. Step 2: Convert to fraction form
    4.58/6.87 = 1.91/x
  3. Step 3: Cross multiply
    4.58x = 6.87 × 1.91
  4. Step 4: Simplify right side
    4.58x = 13.08
  5. Step 5: Solve for x
    x = 13.08/4.58
  6. Step 6: Final answer
    x = 2.86

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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.