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Finding the Fourth Proportional to 28,890.60, 43,335.90 and 12,247.80

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Solution

The fourth proportional to 28,890.60, 43,335.90 and 12,247.80 is: 18,371.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,890.60 : 43,335.90 = 12,247.80 : x
  2. Step 2: Convert to fraction form
    28,890.60/43,335.90 = 12,247.80/x
  3. Step 3: Cross multiply
    28,890.60x = 43,335.90 × 12,247.80
  4. Step 4: Simplify right side
    28,890.60x = 530,769,436.02
  5. Step 5: Solve for x
    x = 530,769,436.02/28,890.60
  6. Step 6: Final answer
    x = 18,371.70

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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.