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Finding the Fourth Proportional to 777.41, 1,160.43 and 685.15

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Solution

The fourth proportional to 777.41, 1,160.43 and 685.15 is: 1,022.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    777.41 : 1,160.43 = 685.15 : x
  2. Step 2: Convert to fraction form
    777.41/1,160.43 = 685.15/x
  3. Step 3: Cross multiply
    777.41x = 1,160.43 × 685.15
  4. Step 4: Simplify right side
    777.41x = 795,065.45
  5. Step 5: Solve for x
    x = 795,065.45/777.41
  6. Step 6: Final answer
    x = 1,022.71

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.