Home / 15,128.91-20,880.45-8,754.57

Finding the Fourth Proportional to 15,128.91, 20,880.45 and 8,754.57

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Solution

The fourth proportional to 15,128.91, 20,880.45 and 8,754.57 is: 12,082.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,128.91 : 20,880.45 = 8,754.57 : x
  2. Step 2: Convert to fraction form
    15,128.91/20,880.45 = 8,754.57/x
  3. Step 3: Cross multiply
    15,128.91x = 20,880.45 × 8,754.57
  4. Step 4: Simplify right side
    15,128.91x = 182,799,361.16
  5. Step 5: Solve for x
    x = 182,799,361.16/15,128.91
  6. Step 6: Final answer
    x = 12,082.78

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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.