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Finding the Fourth Proportional to 777.26, 1,073.22 and 685.10

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Solution

The fourth proportional to 777.26, 1,073.22 and 685.10 is: 945.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    777.26 : 1,073.22 = 685.10 : x
  2. Step 2: Convert to fraction form
    777.26/1,073.22 = 685.10/x
  3. Step 3: Cross multiply
    777.26x = 1,073.22 × 685.10
  4. Step 4: Simplify right side
    777.26x = 735,263.02
  5. Step 5: Solve for x
    x = 735,263.02/777.26
  6. Step 6: Final answer
    x = 945.97

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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.