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Finding the Fourth Proportional to 812.31, 1,120.53 and 563.77

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Solution

The fourth proportional to 812.31, 1,120.53 and 563.77 is: 777.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.31 : 1,120.53 = 563.77 : x
  2. Step 2: Convert to fraction form
    812.31/1,120.53 = 563.77/x
  3. Step 3: Cross multiply
    812.31x = 1,120.53 × 563.77
  4. Step 4: Simplify right side
    812.31x = 631,721.20
  5. Step 5: Solve for x
    x = 631,721.20/812.31
  6. Step 6: Final answer
    x = 777.68

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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.