Home / 21,399.35-29,531.26-12,899.78

Finding the Fourth Proportional to 21,399.35, 29,531.26 and 12,899.78

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Solution

The fourth proportional to 21,399.35, 29,531.26 and 12,899.78 is: 17,801.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,399.35 : 29,531.26 = 12,899.78 : x
  2. Step 2: Convert to fraction form
    21,399.35/29,531.26 = 12,899.78/x
  3. Step 3: Cross multiply
    21,399.35x = 29,531.26 × 12,899.78
  4. Step 4: Simplify right side
    21,399.35x = 380,946,577.22
  5. Step 5: Solve for x
    x = 380,946,577.22/21,399.35
  6. Step 6: Final answer
    x = 17,801.78

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.