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Finding the Fourth Proportional to 847.96, 1,272.78 and 811.96

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Solution

The fourth proportional to 847.96, 1,272.78 and 811.96 is: 1,218.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    847.96 : 1,272.78 = 811.96 : x
  2. Step 2: Convert to fraction form
    847.96/1,272.78 = 811.96/x
  3. Step 3: Cross multiply
    847.96x = 1,272.78 × 811.96
  4. Step 4: Simplify right side
    847.96x = 1,033,446.45
  5. Step 5: Solve for x
    x = 1,033,446.45/847.96
  6. Step 6: Final answer
    x = 1,218.74

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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.