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Finding the Fourth Proportional to 7.64, 11.52 and 7.55

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Solution

The fourth proportional to 7.64, 11.52 and 7.55 is: 11.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    7.64 : 11.52 = 7.55 : x
  2. Step 2: Convert to fraction form
    7.64/11.52 = 7.55/x
  3. Step 3: Cross multiply
    7.64x = 11.52 × 7.55
  4. Step 4: Simplify right side
    7.64x = 86.98
  5. Step 5: Solve for x
    x = 86.98/7.64
  6. Step 6: Final answer
    x = 11.38

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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.