Home / 1,421.43-1,969.17-1,387.41

Finding the Fourth Proportional to 1,421.43, 1,969.17 and 1,387.41

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Solution

The fourth proportional to 1,421.43, 1,969.17 and 1,387.41 is: 1,922.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,421.43 : 1,969.17 = 1,387.41 : x
  2. Step 2: Convert to fraction form
    1,421.43/1,969.17 = 1,387.41/x
  3. Step 3: Cross multiply
    1,421.43x = 1,969.17 × 1,387.41
  4. Step 4: Simplify right side
    1,421.43x = 2,732,046.15
  5. Step 5: Solve for x
    x = 2,732,046.15/1,421.43
  6. Step 6: Final answer
    x = 1,922.04

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.