Home / 21,266.78-31,889.48-12,385.04

Finding the Fourth Proportional to 21,266.78, 31,889.48 and 12,385.04

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Solution

The fourth proportional to 21,266.78, 31,889.48 and 12,385.04 is: 18,571.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,266.78 : 31,889.48 = 12,385.04 : x
  2. Step 2: Convert to fraction form
    21,266.78/31,889.48 = 12,385.04/x
  3. Step 3: Cross multiply
    21,266.78x = 31,889.48 × 12,385.04
  4. Step 4: Simplify right side
    21,266.78x = 394,952,264.01
  5. Step 5: Solve for x
    x = 394,952,264.01/21,266.78
  6. Step 6: Final answer
    x = 18,571.33

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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.