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Finding the Fourth Proportional to 28,570.80, 42,856.20 and 20,260.20

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Solution

The fourth proportional to 28,570.80, 42,856.20 and 20,260.20 is: 30,390.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,570.80 : 42,856.20 = 20,260.20 : x
  2. Step 2: Convert to fraction form
    28,570.80/42,856.20 = 20,260.20/x
  3. Step 3: Cross multiply
    28,570.80x = 42,856.20 × 20,260.20
  4. Step 4: Simplify right side
    28,570.80x = 868,275,183.24
  5. Step 5: Solve for x
    x = 868,275,183.24/28,570.80
  6. Step 6: Final answer
    x = 30,390.30

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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.