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Finding the Fourth Proportional to 9.80, 14.64 and 8

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Solution

The fourth proportional to 9.80, 14.64 and 8 is: 11.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    9.80 : 14.64 = 8 : x
  2. Step 2: Convert to fraction form
    9.80/14.64 = 8/x
  3. Step 3: Cross multiply
    9.80x = 14.64 × 8
  4. Step 4: Simplify right side
    9.80x = 117.12
  5. Step 5: Solve for x
    x = 117.12/9.80
  6. Step 6: Final answer
    x = 11.95

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.