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Finding the Fourth Proportional to 2,156.82, 3,235.66 and 770.12

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Solution

The fourth proportional to 2,156.82, 3,235.66 and 770.12 is: 1,155.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,156.82 : 3,235.66 = 770.12 : x
  2. Step 2: Convert to fraction form
    2,156.82/3,235.66 = 770.12/x
  3. Step 3: Cross multiply
    2,156.82x = 3,235.66 × 770.12
  4. Step 4: Simplify right side
    2,156.82x = 2,491,846.48
  5. Step 5: Solve for x
    x = 2,491,846.48/2,156.82
  6. Step 6: Final answer
    x = 1,155.33

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.