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Finding the Fourth Proportional to 816.29, 1,127.40 and 553.85

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Solution

The fourth proportional to 816.29, 1,127.40 and 553.85 is: 764.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.29 : 1,127.40 = 553.85 : x
  2. Step 2: Convert to fraction form
    816.29/1,127.40 = 553.85/x
  3. Step 3: Cross multiply
    816.29x = 1,127.40 × 553.85
  4. Step 4: Simplify right side
    816.29x = 624,404.85
  5. Step 5: Solve for x
    x = 624,404.85/816.29
  6. Step 6: Final answer
    x = 764.93

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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.