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Finding the Fourth Proportional to 9.80, 13.55 and 8.77

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Solution

The fourth proportional to 9.80, 13.55 and 8.77 is: 12.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    9.80 : 13.55 = 8.77 : x
  2. Step 2: Convert to fraction form
    9.80/13.55 = 8.77/x
  3. Step 3: Cross multiply
    9.80x = 13.55 × 8.77
  4. Step 4: Simplify right side
    9.80x = 118.81
  5. Step 5: Solve for x
    x = 118.81/9.80
  6. Step 6: Final answer
    x = 12.12

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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.