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Finding the Fourth Proportional to 816.12, 1,224.72 and 762.12

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Solution

The fourth proportional to 816.12, 1,224.72 and 762.12 is: 1,143.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.12 : 1,224.72 = 762.12 : x
  2. Step 2: Convert to fraction form
    816.12/1,224.72 = 762.12/x
  3. Step 3: Cross multiply
    816.12x = 1,224.72 × 762.12
  4. Step 4: Simplify right side
    816.12x = 933,383.61
  5. Step 5: Solve for x
    x = 933,383.61/816.12
  6. Step 6: Final answer
    x = 1,143.68

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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.