Home / 21,422.80-29,564.40-11,991.52

Finding the Fourth Proportional to 21,422.80, 29,564.40 and 11,991.52

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Solution

The fourth proportional to 21,422.80, 29,564.40 and 11,991.52 is: 16,548.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,422.80 : 29,564.40 = 11,991.52 : x
  2. Step 2: Convert to fraction form
    21,422.80/29,564.40 = 11,991.52/x
  3. Step 3: Cross multiply
    21,422.80x = 29,564.40 × 11,991.52
  4. Step 4: Simplify right side
    21,422.80x = 354,522,093.89
  5. Step 5: Solve for x
    x = 354,522,093.89/21,422.80
  6. Step 6: Final answer
    x = 16,548.82

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1.5x scale

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.