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Finding the Fourth Proportional to 5.91, 8.91 and 5.73

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Solution

The fourth proportional to 5.91, 8.91 and 5.73 is: 8.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    5.91 : 8.91 = 5.73 : x
  2. Step 2: Convert to fraction form
    5.91/8.91 = 5.73/x
  3. Step 3: Cross multiply
    5.91x = 8.91 × 5.73
  4. Step 4: Simplify right side
    5.91x = 51.05
  5. Step 5: Solve for x
    x = 51.05/5.91
  6. Step 6: Final answer
    x = 8.64

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.