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Finding the Fourth Proportional to 11.80, 17.77 and 9.70

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Solution

The fourth proportional to 11.80, 17.77 and 9.70 is: 14.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.80 : 17.77 = 9.70 : x
  2. Step 2: Convert to fraction form
    11.80/17.77 = 9.70/x
  3. Step 3: Cross multiply
    11.80x = 17.77 × 9.70
  4. Step 4: Simplify right side
    11.80x = 172.37
  5. Step 5: Solve for x
    x = 172.37/11.80
  6. Step 6: Final answer
    x = 14.61

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.