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Finding the Fourth Proportional to 28,043.60, 42,081.60 and 10,515.20

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Solution

The fourth proportional to 28,043.60, 42,081.60 and 10,515.20 is: 15,778.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,043.60 : 42,081.60 = 10,515.20 : x
  2. Step 2: Convert to fraction form
    28,043.60/42,081.60 = 10,515.20/x
  3. Step 3: Cross multiply
    28,043.60x = 42,081.60 × 10,515.20
  4. Step 4: Simplify right side
    28,043.60x = 442,496,440.32
  5. Step 5: Solve for x
    x = 442,496,440.32/28,043.60
  6. Step 6: Final answer
    x = 15,778.87

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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.