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Finding the Fourth Proportional to 810.87, 1,216.33 and 225.87

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Solution

The fourth proportional to 810.87, 1,216.33 and 225.87 is: 338.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.87 : 1,216.33 = 225.87 : x
  2. Step 2: Convert to fraction form
    810.87/1,216.33 = 225.87/x
  3. Step 3: Cross multiply
    810.87x = 1,216.33 × 225.87
  4. Step 4: Simplify right side
    810.87x = 274,736.45
  5. Step 5: Solve for x
    x = 274,736.45/810.87
  6. Step 6: Final answer
    x = 338.82

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.