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Finding the Fourth Proportional to 931.88, 1,287.81 and 833.46

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Solution

The fourth proportional to 931.88, 1,287.81 and 833.46 is: 1,151.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.88 : 1,287.81 = 833.46 : x
  2. Step 2: Convert to fraction form
    931.88/1,287.81 = 833.46/x
  3. Step 3: Cross multiply
    931.88x = 1,287.81 × 833.46
  4. Step 4: Simplify right side
    931.88x = 1,073,338.12
  5. Step 5: Solve for x
    x = 1,073,338.12/931.88
  6. Step 6: Final answer
    x = 1,151.80

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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.