Home / 3,927.70-5,420-2,159.31

Finding the Fourth Proportional to 3,927.70, 5,420 and 2,159.31

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Solution

The fourth proportional to 3,927.70, 5,420 and 2,159.31 is: 2,979.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,927.70 : 5,420 = 2,159.31 : x
  2. Step 2: Convert to fraction form
    3,927.70/5,420 = 2,159.31/x
  3. Step 3: Cross multiply
    3,927.70x = 5,420 × 2,159.31
  4. Step 4: Simplify right side
    3,927.70x = 11,703,433.10
  5. Step 5: Solve for x
    x = 11,703,433.10/3,927.70
  6. Step 6: Final answer
    x = 2,979.72

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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.