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Finding the Fourth Proportional to 777.11, 1,073.07 and 644.22

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Solution

The fourth proportional to 777.11, 1,073.07 and 644.22 is: 889.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    777.11 : 1,073.07 = 644.22 : x
  2. Step 2: Convert to fraction form
    777.11/1,073.07 = 644.22/x
  3. Step 3: Cross multiply
    777.11x = 1,073.07 × 644.22
  4. Step 4: Simplify right side
    777.11x = 691,293.16
  5. Step 5: Solve for x
    x = 691,293.16/777.11
  6. Step 6: Final answer
    x = 889.57

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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.