Home / 21,129.90-31,690.80-6,339.30

Finding the Fourth Proportional to 21,129.90, 31,690.80 and 6,339.30

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Solution

The fourth proportional to 21,129.90, 31,690.80 and 6,339.30 is: 9,507.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,129.90 : 31,690.80 = 6,339.30 : x
  2. Step 2: Convert to fraction form
    21,129.90/31,690.80 = 6,339.30/x
  3. Step 3: Cross multiply
    21,129.90x = 31,690.80 × 6,339.30
  4. Step 4: Simplify right side
    21,129.90x = 200,897,488.44
  5. Step 5: Solve for x
    x = 200,897,488.44/21,129.90
  6. Step 6: Final answer
    x = 9,507.73

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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.