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Finding the Fourth Proportional to 9.16, 13.80 and 7.89

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Solution

The fourth proportional to 9.16, 13.80 and 7.89 is: 11.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    9.16 : 13.80 = 7.89 : x
  2. Step 2: Convert to fraction form
    9.16/13.80 = 7.89/x
  3. Step 3: Cross multiply
    9.16x = 13.80 × 7.89
  4. Step 4: Simplify right side
    9.16x = 108.82
  5. Step 5: Solve for x
    x = 108.82/9.16
  6. Step 6: Final answer
    x = 11.88

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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.