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Finding the Fourth Proportional to 4.80, 6.67 and 4.78

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Solution

The fourth proportional to 4.80, 6.67 and 4.78 is: 6.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    4.80 : 6.67 = 4.78 : x
  2. Step 2: Convert to fraction form
    4.80/6.67 = 4.78/x
  3. Step 3: Cross multiply
    4.80x = 6.67 × 4.78
  4. Step 4: Simplify right side
    4.80x = 31.88
  5. Step 5: Solve for x
    x = 31.88/4.80
  6. Step 6: Final answer
    x = 6.64

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Find fourth proportional to 2.40, 3.34 and 2.39
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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.