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Finding the Fourth Proportional to 11.30, 15.60 and 7.21

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Solution

The fourth proportional to 11.30, 15.60 and 7.21 is: 9.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.30 : 15.60 = 7.21 : x
  2. Step 2: Convert to fraction form
    11.30/15.60 = 7.21/x
  3. Step 3: Cross multiply
    11.30x = 15.60 × 7.21
  4. Step 4: Simplify right side
    11.30x = 112.43
  5. Step 5: Solve for x
    x = 112.43/11.30
  6. Step 6: Final answer
    x = 9.95

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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.