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Finding the Fourth Proportional to 10.66, 14.72 and 7.22

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Solution

The fourth proportional to 10.66, 14.72 and 7.22 is: 9.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    10.66 : 14.72 = 7.22 : x
  2. Step 2: Convert to fraction form
    10.66/14.72 = 7.22/x
  3. Step 3: Cross multiply
    10.66x = 14.72 × 7.22
  4. Step 4: Simplify right side
    10.66x = 106.28
  5. Step 5: Solve for x
    x = 106.28/10.66
  6. Step 6: Final answer
    x = 9.97

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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.