Home / 21,185.39-31,739.36-9,920.06

Finding the Fourth Proportional to 21,185.39, 31,739.36 and 9,920.06

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Solution

The fourth proportional to 21,185.39, 31,739.36 and 9,920.06 is: 14,861.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,185.39 : 31,739.36 = 9,920.06 : x
  2. Step 2: Convert to fraction form
    21,185.39/31,739.36 = 9,920.06/x
  3. Step 3: Cross multiply
    21,185.39x = 31,739.36 × 9,920.06
  4. Step 4: Simplify right side
    21,185.39x = 314,856,147.26
  5. Step 5: Solve for x
    x = 314,856,147.26/21,185.39
  6. Step 6: Final answer
    x = 14,861.95

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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.