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Finding the Fourth Proportional to 6.79, 9.36 and 4.20

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Solution

The fourth proportional to 6.79, 9.36 and 4.20 is: 5.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    6.79 : 9.36 = 4.20 : x
  2. Step 2: Convert to fraction form
    6.79/9.36 = 4.20/x
  3. Step 3: Cross multiply
    6.79x = 9.36 × 4.20
  4. Step 4: Simplify right side
    6.79x = 39.27
  5. Step 5: Solve for x
    x = 39.27/6.79
  6. Step 6: Final answer
    x = 5.79

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.