Home / 21,120.74-29,120.13-13,553.72

Finding the Fourth Proportional to 21,120.74, 29,120.13 and 13,553.72

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Solution

The fourth proportional to 21,120.74, 29,120.13 and 13,553.72 is: 18,687.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,120.74 : 29,120.13 = 13,553.72 : x
  2. Step 2: Convert to fraction form
    21,120.74/29,120.13 = 13,553.72/x
  3. Step 3: Cross multiply
    21,120.74x = 29,120.13 × 13,553.72
  4. Step 4: Simplify right side
    21,120.74x = 394,686,088.38
  5. Step 5: Solve for x
    x = 394,686,088.38/21,120.74
  6. Step 6: Final answer
    x = 18,687.13

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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.