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Finding the Fourth Proportional to 8.50, 12.70 and 7.74

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Solution

The fourth proportional to 8.50, 12.70 and 7.74 is: 11.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    8.50 : 12.70 = 7.74 : x
  2. Step 2: Convert to fraction form
    8.50/12.70 = 7.74/x
  3. Step 3: Cross multiply
    8.50x = 12.70 × 7.74
  4. Step 4: Simplify right side
    8.50x = 98.30
  5. Step 5: Solve for x
    x = 98.30/8.50
  6. Step 6: Final answer
    x = 11.56

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.