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Finding the Fourth Proportional to 28,286.40, 42,418.80 and 8,558.40

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Solution

The fourth proportional to 28,286.40, 42,418.80 and 8,558.40 is: 12,834.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,286.40 : 42,418.80 = 8,558.40 : x
  2. Step 2: Convert to fraction form
    28,286.40/42,418.80 = 8,558.40/x
  3. Step 3: Cross multiply
    28,286.40x = 42,418.80 × 8,558.40
  4. Step 4: Simplify right side
    28,286.40x = 363,037,057.92
  5. Step 5: Solve for x
    x = 363,037,057.92/28,286.40
  6. Step 6: Final answer
    x = 12,834.33

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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.