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Finding the Fourth Proportional to 9.87, 13.60 and 7.82

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Solution

The fourth proportional to 9.87, 13.60 and 7.82 is: 10.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    9.87 : 13.60 = 7.82 : x
  2. Step 2: Convert to fraction form
    9.87/13.60 = 7.82/x
  3. Step 3: Cross multiply
    9.87x = 13.60 × 7.82
  4. Step 4: Simplify right side
    9.87x = 106.28
  5. Step 5: Solve for x
    x = 106.28/9.87
  6. Step 6: Final answer
    x = 10.77

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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.