Home / 20,691.88-31,030.26-7,540.36

Finding the Fourth Proportional to 20,691.88, 31,030.26 and 7,540.36

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Solution

The fourth proportional to 20,691.88, 31,030.26 and 7,540.36 is: 11,307.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,691.88 : 31,030.26 = 7,540.36 : x
  2. Step 2: Convert to fraction form
    20,691.88/31,030.26 = 7,540.36/x
  3. Step 3: Cross multiply
    20,691.88x = 31,030.26 × 7,540.36
  4. Step 4: Simplify right side
    20,691.88x = 233,979,331.29
  5. Step 5: Solve for x
    x = 233,979,331.29/20,691.88
  6. Step 6: Final answer
    x = 11,307.79

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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.