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Finding the Fourth Proportional to 1,926.84, 2,891.24 and 831.21

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Solution

The fourth proportional to 1,926.84, 2,891.24 and 831.21 is: 1,247.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,926.84 : 2,891.24 = 831.21 : x
  2. Step 2: Convert to fraction form
    1,926.84/2,891.24 = 831.21/x
  3. Step 3: Cross multiply
    1,926.84x = 2,891.24 × 831.21
  4. Step 4: Simplify right side
    1,926.84x = 2,403,236.66
  5. Step 5: Solve for x
    x = 2,403,236.66/1,926.84
  6. Step 6: Final answer
    x = 1,247.24

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.