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Finding the Fourth Proportional to 7.28, 10.85 and 6.99

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Solution

The fourth proportional to 7.28, 10.85 and 6.99 is: 10.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    7.28 : 10.85 = 6.99 : x
  2. Step 2: Convert to fraction form
    7.28/10.85 = 6.99/x
  3. Step 3: Cross multiply
    7.28x = 10.85 × 6.99
  4. Step 4: Simplify right side
    7.28x = 75.81
  5. Step 5: Solve for x
    x = 75.81/7.28
  6. Step 6: Final answer
    x = 10.42

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.