Home / 21,381.11-29,503.89-12,429.06

Finding the Fourth Proportional to 21,381.11, 29,503.89 and 12,429.06

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Solution

The fourth proportional to 21,381.11, 29,503.89 and 12,429.06 is: 17,150.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,381.11 : 29,503.89 = 12,429.06 : x
  2. Step 2: Convert to fraction form
    21,381.11/29,503.89 = 12,429.06/x
  3. Step 3: Cross multiply
    21,381.11x = 29,503.89 × 12,429.06
  4. Step 4: Simplify right side
    21,381.11x = 366,705,619.04
  5. Step 5: Solve for x
    x = 366,705,619.04/21,381.11
  6. Step 6: Final answer
    x = 17,150.91

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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.