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Finding the Fourth Proportional to 2,156.15, 3,234.63 and 770.33

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Solution

The fourth proportional to 2,156.15, 3,234.63 and 770.33 is: 1,155.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,156.15 : 3,234.63 = 770.33 : x
  2. Step 2: Convert to fraction form
    2,156.15/3,234.63 = 770.33/x
  3. Step 3: Cross multiply
    2,156.15x = 3,234.63 × 770.33
  4. Step 4: Simplify right side
    2,156.15x = 2,491,732.53
  5. Step 5: Solve for x
    x = 2,491,732.53/2,156.15
  6. Step 6: Final answer
    x = 1,155.64

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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.