Home / 21,601.90-29,809.92-13,218.40

Finding the Fourth Proportional to 21,601.90, 29,809.92 and 13,218.40

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Solution

The fourth proportional to 21,601.90, 29,809.92 and 13,218.40 is: 18,240.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,601.90 : 29,809.92 = 13,218.40 : x
  2. Step 2: Convert to fraction form
    21,601.90/29,809.92 = 13,218.40/x
  3. Step 3: Cross multiply
    21,601.90x = 29,809.92 × 13,218.40
  4. Step 4: Simplify right side
    21,601.90x = 394,039,446.53
  5. Step 5: Solve for x
    x = 394,039,446.53/21,601.90
  6. Step 6: Final answer
    x = 18,240.96

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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.