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Finding the Fourth Proportional to 7.05, 9.74 and 6.87

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Solution

The fourth proportional to 7.05, 9.74 and 6.87 is: 9.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    7.05 : 9.74 = 6.87 : x
  2. Step 2: Convert to fraction form
    7.05/9.74 = 6.87/x
  3. Step 3: Cross multiply
    7.05x = 9.74 × 6.87
  4. Step 4: Simplify right side
    7.05x = 66.91
  5. Step 5: Solve for x
    x = 66.91/7.05
  6. Step 6: Final answer
    x = 9.49

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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.