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Finding the Fourth Proportional to 2,543.12, 3,815.16 and 811.28

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Solution

The fourth proportional to 2,543.12, 3,815.16 and 811.28 is: 1,217.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,543.12 : 3,815.16 = 811.28 : x
  2. Step 2: Convert to fraction form
    2,543.12/3,815.16 = 811.28/x
  3. Step 3: Cross multiply
    2,543.12x = 3,815.16 × 811.28
  4. Step 4: Simplify right side
    2,543.12x = 3,095,163.00
  5. Step 5: Solve for x
    x = 3,095,163.00/2,543.12
  6. Step 6: Final answer
    x = 1,217.07

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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.