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Finding the Fourth Proportional to 6.88, 9.48 and 6.64

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Solution

The fourth proportional to 6.88, 9.48 and 6.64 is: 9.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    6.88 : 9.48 = 6.64 : x
  2. Step 2: Convert to fraction form
    6.88/9.48 = 6.64/x
  3. Step 3: Cross multiply
    6.88x = 9.48 × 6.64
  4. Step 4: Simplify right side
    6.88x = 62.95
  5. Step 5: Solve for x
    x = 62.95/6.88
  6. Step 6: Final answer
    x = 9.15

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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.