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Finding the Fourth Proportional to 9.81, 14.70 and 7.82

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Solution

The fourth proportional to 9.81, 14.70 and 7.82 is: 11.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    9.81 : 14.70 = 7.82 : x
  2. Step 2: Convert to fraction form
    9.81/14.70 = 7.82/x
  3. Step 3: Cross multiply
    9.81x = 14.70 × 7.82
  4. Step 4: Simplify right side
    9.81x = 114.95
  5. Step 5: Solve for x
    x = 114.95/9.81
  6. Step 6: Final answer
    x = 11.72

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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.