Home / 3,129.28-4,317.56-1,869.78

Finding the Fourth Proportional to 3,129.28, 4,317.56 and 1,869.78

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Solution

The fourth proportional to 3,129.28, 4,317.56 and 1,869.78 is: 2,579.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,129.28 : 4,317.56 = 1,869.78 : x
  2. Step 2: Convert to fraction form
    3,129.28/4,317.56 = 1,869.78/x
  3. Step 3: Cross multiply
    3,129.28x = 4,317.56 × 1,869.78
  4. Step 4: Simplify right side
    3,129.28x = 8,072,865.75
  5. Step 5: Solve for x
    x = 8,072,865.75/3,129.28
  6. Step 6: Final answer
    x = 2,579.78

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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.