Home / 21,824.07-30,120.63-12,872.55

Finding the Fourth Proportional to 21,824.07, 30,120.63 and 12,872.55

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Solution

The fourth proportional to 21,824.07, 30,120.63 and 12,872.55 is: 17,766.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,824.07 : 30,120.63 = 12,872.55 : x
  2. Step 2: Convert to fraction form
    21,824.07/30,120.63 = 12,872.55/x
  3. Step 3: Cross multiply
    21,824.07x = 30,120.63 × 12,872.55
  4. Step 4: Simplify right side
    21,824.07x = 387,729,315.71
  5. Step 5: Solve for x
    x = 387,729,315.71/21,824.07
  6. Step 6: Final answer
    x = 17,766.13

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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.