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Finding the Fourth Proportional to 6.60, 9.91 and 4.80

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Solution

The fourth proportional to 6.60, 9.91 and 4.80 is: 7.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    6.60 : 9.91 = 4.80 : x
  2. Step 2: Convert to fraction form
    6.60/9.91 = 4.80/x
  3. Step 3: Cross multiply
    6.60x = 9.91 × 4.80
  4. Step 4: Simplify right side
    6.60x = 47.57
  5. Step 5: Solve for x
    x = 47.57/6.60
  6. Step 6: Final answer
    x = 7.21

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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.