Home / 21,399.80-29,531.79-11,967.75

Finding the Fourth Proportional to 21,399.80, 29,531.79 and 11,967.75

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Solution

The fourth proportional to 21,399.80, 29,531.79 and 11,967.75 is: 16,515.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,399.80 : 29,531.79 = 11,967.75 : x
  2. Step 2: Convert to fraction form
    21,399.80/29,531.79 = 11,967.75/x
  3. Step 3: Cross multiply
    21,399.80x = 29,531.79 × 11,967.75
  4. Step 4: Simplify right side
    21,399.80x = 353,429,079.77
  5. Step 5: Solve for x
    x = 353,429,079.77/21,399.80
  6. Step 6: Final answer
    x = 16,515.54

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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.