Home / 21,239.44-31,840.70-12,455.90

Finding the Fourth Proportional to 21,239.44, 31,840.70 and 12,455.90

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Solution

The fourth proportional to 21,239.44, 31,840.70 and 12,455.90 is: 18,673.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,239.44 : 31,840.70 = 12,455.90 : x
  2. Step 2: Convert to fraction form
    21,239.44/31,840.70 = 12,455.90/x
  3. Step 3: Cross multiply
    21,239.44x = 31,840.70 × 12,455.90
  4. Step 4: Simplify right side
    21,239.44x = 396,604,566.47
  5. Step 5: Solve for x
    x = 396,604,566.47/21,239.44
  6. Step 6: Final answer
    x = 18,673.03

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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.