Home / 3,927.79-5,420.25-2,159.35

Finding the Fourth Proportional to 3,927.79, 5,420.25 and 2,159.35

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Solution

The fourth proportional to 3,927.79, 5,420.25 and 2,159.35 is: 2,979.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,927.79 : 5,420.25 = 2,159.35 : x
  2. Step 2: Convert to fraction form
    3,927.79/5,420.25 = 2,159.35/x
  3. Step 3: Cross multiply
    3,927.79x = 5,420.25 × 2,159.35
  4. Step 4: Simplify right side
    3,927.79x = 11,704,216.84
  5. Step 5: Solve for x
    x = 11,704,216.84/3,927.79
  6. Step 6: Final answer
    x = 2,979.85

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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.