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Finding the Fourth Proportional to 4.89, 6.72 and 4.20

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Solution

The fourth proportional to 4.89, 6.72 and 4.20 is: 5.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    4.89 : 6.72 = 4.20 : x
  2. Step 2: Convert to fraction form
    4.89/6.72 = 4.20/x
  3. Step 3: Cross multiply
    4.89x = 6.72 × 4.20
  4. Step 4: Simplify right side
    4.89x = 28.22
  5. Step 5: Solve for x
    x = 28.22/4.89
  6. Step 6: Final answer
    x = 5.77

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.