Home / 20,919.12-28,851.42-18,395.88

Finding the Fourth Proportional to 20,919.12, 28,851.42 and 18,395.88

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Solution

The fourth proportional to 20,919.12, 28,851.42 and 18,395.88 is: 25,371.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,919.12 : 28,851.42 = 18,395.88 : x
  2. Step 2: Convert to fraction form
    20,919.12/28,851.42 = 18,395.88/x
  3. Step 3: Cross multiply
    20,919.12x = 28,851.42 × 18,395.88
  4. Step 4: Simplify right side
    20,919.12x = 530,747,260.15
  5. Step 5: Solve for x
    x = 530,747,260.15/20,919.12
  6. Step 6: Final answer
    x = 25,371.40

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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.