Home / 21,118.55-29,135.29-13,563.82

Finding the Fourth Proportional to 21,118.55, 29,135.29 and 13,563.82

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Solution

The fourth proportional to 21,118.55, 29,135.29 and 13,563.82 is: 18,712.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,118.55 : 29,135.29 = 13,563.82 : x
  2. Step 2: Convert to fraction form
    21,118.55/29,135.29 = 13,563.82/x
  3. Step 3: Cross multiply
    21,118.55x = 29,135.29 × 13,563.82
  4. Step 4: Simplify right side
    21,118.55x = 395,185,857.15
  5. Step 5: Solve for x
    x = 395,185,857.15/21,118.55
  6. Step 6: Final answer
    x = 18,712.74

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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.