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Finding the Fourth Proportional to 816.55, 1,126.84 and 443.54

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Solution

The fourth proportional to 816.55, 1,126.84 and 443.54 is: 612.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.55 : 1,126.84 = 443.54 : x
  2. Step 2: Convert to fraction form
    816.55/1,126.84 = 443.54/x
  3. Step 3: Cross multiply
    816.55x = 1,126.84 × 443.54
  4. Step 4: Simplify right side
    816.55x = 499,793.53
  5. Step 5: Solve for x
    x = 499,793.53/816.55
  6. Step 6: Final answer
    x = 612.08

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.