Home / 28,491.10-42,745.28-20,187.18

Finding the Fourth Proportional to 28,491.10, 42,745.28 and 20,187.18

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Solution

The fourth proportional to 28,491.10, 42,745.28 and 20,187.18 is: 30,286.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,491.10 : 42,745.28 = 20,187.18 : x
  2. Step 2: Convert to fraction form
    28,491.10/42,745.28 = 20,187.18/x
  3. Step 3: Cross multiply
    28,491.10x = 42,745.28 × 20,187.18
  4. Step 4: Simplify right side
    28,491.10x = 862,906,661.51
  5. Step 5: Solve for x
    x = 862,906,661.51/28,491.10
  6. Step 6: Final answer
    x = 30,286.88

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.