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Finding the Fourth Proportional to 1,391.43, 1,920.21 and 801.96

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Solution

The fourth proportional to 1,391.43, 1,920.21 and 801.96 is: 1,106.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.43 : 1,920.21 = 801.96 : x
  2. Step 2: Convert to fraction form
    1,391.43/1,920.21 = 801.96/x
  3. Step 3: Cross multiply
    1,391.43x = 1,920.21 × 801.96
  4. Step 4: Simplify right side
    1,391.43x = 1,539,931.61
  5. Step 5: Solve for x
    x = 1,539,931.61/1,391.43
  6. Step 6: Final answer
    x = 1,106.73

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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.