Home / 21,239.40-29,322.66-15,891.36

Finding the Fourth Proportional to 21,239.40, 29,322.66 and 15,891.36

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Solution

The fourth proportional to 21,239.40, 29,322.66 and 15,891.36 is: 21,939.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,239.40 : 29,322.66 = 15,891.36 : x
  2. Step 2: Convert to fraction form
    21,239.40/29,322.66 = 15,891.36/x
  3. Step 3: Cross multiply
    21,239.40x = 29,322.66 × 15,891.36
  4. Step 4: Simplify right side
    21,239.40x = 465,976,946.22
  5. Step 5: Solve for x
    x = 465,976,946.22/21,239.40
  6. Step 6: Final answer
    x = 21,939.27

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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.