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Finding the Fourth Proportional to 10.64, 15.94 and 9.21

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Solution

The fourth proportional to 10.64, 15.94 and 9.21 is: 13.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    10.64 : 15.94 = 9.21 : x
  2. Step 2: Convert to fraction form
    10.64/15.94 = 9.21/x
  3. Step 3: Cross multiply
    10.64x = 15.94 × 9.21
  4. Step 4: Simplify right side
    10.64x = 146.81
  5. Step 5: Solve for x
    x = 146.81/10.64
  6. Step 6: Final answer
    x = 13.80

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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.