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Finding the Fourth Proportional to 8.55, 11.80 and 4.91

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Solution

The fourth proportional to 8.55, 11.80 and 4.91 is: 6.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    8.55 : 11.80 = 4.91 : x
  2. Step 2: Convert to fraction form
    8.55/11.80 = 4.91/x
  3. Step 3: Cross multiply
    8.55x = 11.80 × 4.91
  4. Step 4: Simplify right side
    8.55x = 57.93
  5. Step 5: Solve for x
    x = 57.93/8.55
  6. Step 6: Final answer
    x = 6.78

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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.