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Finding the Fourth Proportional to 813.76, 1,221.18 and 403.18

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Solution

The fourth proportional to 813.76, 1,221.18 and 403.18 is: 605.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.76 : 1,221.18 = 403.18 : x
  2. Step 2: Convert to fraction form
    813.76/1,221.18 = 403.18/x
  3. Step 3: Cross multiply
    813.76x = 1,221.18 × 403.18
  4. Step 4: Simplify right side
    813.76x = 492,355.35
  5. Step 5: Solve for x
    x = 492,355.35/813.76
  6. Step 6: Final answer
    x = 605.04

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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.