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Finding the Fourth Proportional to 2,155.75, 3,234.53 and 858.13

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Solution

The fourth proportional to 2,155.75, 3,234.53 and 858.13 is: 1,287.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,155.75 : 3,234.53 = 858.13 : x
  2. Step 2: Convert to fraction form
    2,155.75/3,234.53 = 858.13/x
  3. Step 3: Cross multiply
    2,155.75x = 3,234.53 × 858.13
  4. Step 4: Simplify right side
    2,155.75x = 2,775,641.29
  5. Step 5: Solve for x
    x = 2,775,641.29/2,155.75
  6. Step 6: Final answer
    x = 1,287.55

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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.