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Finding the Fourth Proportional to 9.31, 13.97 and 4.80

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Solution

The fourth proportional to 9.31, 13.97 and 4.80 is: 7.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    9.31 : 13.97 = 4.80 : x
  2. Step 2: Convert to fraction form
    9.31/13.97 = 4.80/x
  3. Step 3: Cross multiply
    9.31x = 13.97 × 4.80
  4. Step 4: Simplify right side
    9.31x = 66.96
  5. Step 5: Solve for x
    x = 66.96/9.31
  6. Step 6: Final answer
    x = 7.20

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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.