Home / 3,926.79-5,418.87-2,158.35

Finding the Fourth Proportional to 3,926.79, 5,418.87 and 2,158.35

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Solution

The fourth proportional to 3,926.79, 5,418.87 and 2,158.35 is: 2,978.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,926.79 : 5,418.87 = 2,158.35 : x
  2. Step 2: Convert to fraction form
    3,926.79/5,418.87 = 2,158.35/x
  3. Step 3: Cross multiply
    3,926.79x = 5,418.87 × 2,158.35
  4. Step 4: Simplify right side
    3,926.79x = 11,695,818.06
  5. Step 5: Solve for x
    x = 11,695,818.06/3,926.79
  6. Step 6: Final answer
    x = 2,978.47

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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.