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Finding the Fourth Proportional to 816.25, 1,126.49 and 505.81

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Solution

The fourth proportional to 816.25, 1,126.49 and 505.81 is: 698.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.25 : 1,126.49 = 505.81 : x
  2. Step 2: Convert to fraction form
    816.25/1,126.49 = 505.81/x
  3. Step 3: Cross multiply
    816.25x = 1,126.49 × 505.81
  4. Step 4: Simplify right side
    816.25x = 569,789.91
  5. Step 5: Solve for x
    x = 569,789.91/816.25
  6. Step 6: Final answer
    x = 698.06

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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.