Home / 21,321.74-29,418.30-20,480.96

Finding the Fourth Proportional to 21,321.74, 29,418.30 and 20,480.96

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Solution

The fourth proportional to 21,321.74, 29,418.30 and 20,480.96 is: 28,258.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,321.74 : 29,418.30 = 20,480.96 : x
  2. Step 2: Convert to fraction form
    21,321.74/29,418.30 = 20,480.96/x
  3. Step 3: Cross multiply
    21,321.74x = 29,418.30 × 20,480.96
  4. Step 4: Simplify right side
    21,321.74x = 602,514,878.48
  5. Step 5: Solve for x
    x = 602,514,878.48/21,321.74
  6. Step 6: Final answer
    x = 28,258.25

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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.