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Finding the Fourth Proportional to 10.21, 15.40 and 10.06

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Solution

The fourth proportional to 10.21, 15.40 and 10.06 is: 15.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    10.21 : 15.40 = 10.06 : x
  2. Step 2: Convert to fraction form
    10.21/15.40 = 10.06/x
  3. Step 3: Cross multiply
    10.21x = 15.40 × 10.06
  4. Step 4: Simplify right side
    10.21x = 154.92
  5. Step 5: Solve for x
    x = 154.92/10.21
  6. Step 6: Final answer
    x = 15.17

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.