Home / 20,885.26-28,808.89-12,381.68

Finding the Fourth Proportional to 20,885.26, 28,808.89 and 12,381.68

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Solution

The fourth proportional to 20,885.26, 28,808.89 and 12,381.68 is: 17,079.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,885.26 : 28,808.89 = 12,381.68 : x
  2. Step 2: Convert to fraction form
    20,885.26/28,808.89 = 12,381.68/x
  3. Step 3: Cross multiply
    20,885.26x = 28,808.89 × 12,381.68
  4. Step 4: Simplify right side
    20,885.26x = 356,702,395.23
  5. Step 5: Solve for x
    x = 356,702,395.23/20,885.26
  6. Step 6: Final answer
    x = 17,079.15

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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.