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Finding the Fourth Proportional to 10.21, 15.29 and 6.99

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Solution

The fourth proportional to 10.21, 15.29 and 6.99 is: 10.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    10.21 : 15.29 = 6.99 : x
  2. Step 2: Convert to fraction form
    10.21/15.29 = 6.99/x
  3. Step 3: Cross multiply
    10.21x = 15.29 × 6.99
  4. Step 4: Simplify right side
    10.21x = 106.91
  5. Step 5: Solve for x
    x = 106.91/10.21
  6. Step 6: Final answer
    x = 10.48

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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.