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Finding the Fourth Proportional to 811.80, 1,217.07 and 372.75

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Solution

The fourth proportional to 811.80, 1,217.07 and 372.75 is: 558.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.80 : 1,217.07 = 372.75 : x
  2. Step 2: Convert to fraction form
    811.80/1,217.07 = 372.75/x
  3. Step 3: Cross multiply
    811.80x = 1,217.07 × 372.75
  4. Step 4: Simplify right side
    811.80x = 453,662.84
  5. Step 5: Solve for x
    x = 453,662.84/811.80
  6. Step 6: Final answer
    x = 558.84

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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.