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Finding the Fourth Proportional to 28,570.60, 42,855.90 and 8,855.20

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Solution

The fourth proportional to 28,570.60, 42,855.90 and 8,855.20 is: 13,282.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,570.60 : 42,855.90 = 8,855.20 : x
  2. Step 2: Convert to fraction form
    28,570.60/42,855.90 = 8,855.20/x
  3. Step 3: Cross multiply
    28,570.60x = 42,855.90 × 8,855.20
  4. Step 4: Simplify right side
    28,570.60x = 379,497,565.68
  5. Step 5: Solve for x
    x = 379,497,565.68/28,570.60
  6. Step 6: Final answer
    x = 13,282.80

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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.