Home / 3,439.69-5,156.66-1,387.21

Finding the Fourth Proportional to 3,439.69, 5,156.66 and 1,387.21

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Solution

The fourth proportional to 3,439.69, 5,156.66 and 1,387.21 is: 2,079.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,439.69 : 5,156.66 = 1,387.21 : x
  2. Step 2: Convert to fraction form
    3,439.69/5,156.66 = 1,387.21/x
  3. Step 3: Cross multiply
    3,439.69x = 5,156.66 × 1,387.21
  4. Step 4: Simplify right side
    3,439.69x = 7,153,363.38
  5. Step 5: Solve for x
    x = 7,153,363.38/3,439.69
  6. Step 6: Final answer
    x = 2,079.65

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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.