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Finding the Fourth Proportional to 811.58, 1,217.76 and 325.58

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Solution

The fourth proportional to 811.58, 1,217.76 and 325.58 is: 488.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.58 : 1,217.76 = 325.58 : x
  2. Step 2: Convert to fraction form
    811.58/1,217.76 = 325.58/x
  3. Step 3: Cross multiply
    811.58x = 1,217.76 × 325.58
  4. Step 4: Simplify right side
    811.58x = 396,478.30
  5. Step 5: Solve for x
    x = 396,478.30/811.58
  6. Step 6: Final answer
    x = 488.53

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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.