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Finding the Fourth Proportional to 9.88, 13.63 and 5.57

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Solution

The fourth proportional to 9.88, 13.63 and 5.57 is: 7.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    9.88 : 13.63 = 5.57 : x
  2. Step 2: Convert to fraction form
    9.88/13.63 = 5.57/x
  3. Step 3: Cross multiply
    9.88x = 13.63 × 5.57
  4. Step 4: Simplify right side
    9.88x = 75.85
  5. Step 5: Solve for x
    x = 75.85/9.88
  6. Step 6: Final answer
    x = 7.68

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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.