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Finding the Fourth Proportional to 907.13, 1,250.43 and 831.80

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Solution

The fourth proportional to 907.13, 1,250.43 and 831.80 is: 1,146.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    907.13 : 1,250.43 = 831.80 : x
  2. Step 2: Convert to fraction form
    907.13/1,250.43 = 831.80/x
  3. Step 3: Cross multiply
    907.13x = 1,250.43 × 831.80
  4. Step 4: Simplify right side
    907.13x = 1,040,107.67
  5. Step 5: Solve for x
    x = 1,040,107.67/907.13
  6. Step 6: Final answer
    x = 1,146.59

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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.