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Finding the Fourth Proportional to 10.81, 14.90 and 7.70

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Solution

The fourth proportional to 10.81, 14.90 and 7.70 is: 10.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    10.81 : 14.90 = 7.70 : x
  2. Step 2: Convert to fraction form
    10.81/14.90 = 7.70/x
  3. Step 3: Cross multiply
    10.81x = 14.90 × 7.70
  4. Step 4: Simplify right side
    10.81x = 114.73
  5. Step 5: Solve for x
    x = 114.73/10.81
  6. Step 6: Final answer
    x = 10.61

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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.