Home / 21,721.55-29,966.82-13,216.85

Finding the Fourth Proportional to 21,721.55, 29,966.82 and 13,216.85

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Solution

The fourth proportional to 21,721.55, 29,966.82 and 13,216.85 is: 18,233.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,721.55 : 29,966.82 = 13,216.85 : x
  2. Step 2: Convert to fraction form
    21,721.55/29,966.82 = 13,216.85/x
  3. Step 3: Cross multiply
    21,721.55x = 29,966.82 × 13,216.85
  4. Step 4: Simplify right side
    21,721.55x = 396,066,815.08
  5. Step 5: Solve for x
    x = 396,066,815.08/21,721.55
  6. Step 6: Final answer
    x = 18,233.82

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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.