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Finding the Fourth Proportional to 767.73, 1,145.70 and 685.71

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Solution

The fourth proportional to 767.73, 1,145.70 and 685.71 is: 1,023.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    767.73 : 1,145.70 = 685.71 : x
  2. Step 2: Convert to fraction form
    767.73/1,145.70 = 685.71/x
  3. Step 3: Cross multiply
    767.73x = 1,145.70 × 685.71
  4. Step 4: Simplify right side
    767.73x = 785,617.95
  5. Step 5: Solve for x
    x = 785,617.95/767.73
  6. Step 6: Final answer
    x = 1,023.30

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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.