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Finding the Fourth Proportional to 4.41, 6.61 and 1.20

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Solution

The fourth proportional to 4.41, 6.61 and 1.20 is: 1.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    4.41 : 6.61 = 1.20 : x
  2. Step 2: Convert to fraction form
    4.41/6.61 = 1.20/x
  3. Step 3: Cross multiply
    4.41x = 6.61 × 1.20
  4. Step 4: Simplify right side
    4.41x = 7.92
  5. Step 5: Solve for x
    x = 7.92/4.41
  6. Step 6: Final answer
    x = 1.80

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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.