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Finding the Fourth Proportional to 11.35, 15.66 and 7.70

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Solution

The fourth proportional to 11.35, 15.66 and 7.70 is: 10.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.35 : 15.66 = 7.70 : x
  2. Step 2: Convert to fraction form
    11.35/15.66 = 7.70/x
  3. Step 3: Cross multiply
    11.35x = 15.66 × 7.70
  4. Step 4: Simplify right side
    11.35x = 120.60
  5. Step 5: Solve for x
    x = 120.60/11.35
  6. Step 6: Final answer
    x = 10.63

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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.