Home / 21,823.75-30,115.36-12,869.20

Finding the Fourth Proportional to 21,823.75, 30,115.36 and 12,869.20

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Solution

The fourth proportional to 21,823.75, 30,115.36 and 12,869.20 is: 17,758.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,823.75 : 30,115.36 = 12,869.20 : x
  2. Step 2: Convert to fraction form
    21,823.75/30,115.36 = 12,869.20/x
  3. Step 3: Cross multiply
    21,823.75x = 30,115.36 × 12,869.20
  4. Step 4: Simplify right side
    21,823.75x = 387,560,558.74
  5. Step 5: Solve for x
    x = 387,560,558.74/21,823.75
  6. Step 6: Final answer
    x = 17,758.66

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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.