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Finding the Fourth Proportional to 907.17, 1,251.41 and 685.73

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Solution

The fourth proportional to 907.17, 1,251.41 and 685.73 is: 945.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    907.17 : 1,251.41 = 685.73 : x
  2. Step 2: Convert to fraction form
    907.17/1,251.41 = 685.73/x
  3. Step 3: Cross multiply
    907.17x = 1,251.41 × 685.73
  4. Step 4: Simplify right side
    907.17x = 858,129.08
  5. Step 5: Solve for x
    x = 858,129.08/907.17
  6. Step 6: Final answer
    x = 945.94

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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.