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Finding the Fourth Proportional to 28,615, 42,872.46 and 19,855.48

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Solution

The fourth proportional to 28,615, 42,872.46 and 19,855.48 is: 29,748.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,615 : 42,872.46 = 19,855.48 : x
  2. Step 2: Convert to fraction form
    28,615/42,872.46 = 19,855.48/x
  3. Step 3: Cross multiply
    28,615x = 42,872.46 × 19,855.48
  4. Step 4: Simplify right side
    28,615x = 851,253,272.08
  5. Step 5: Solve for x
    x = 851,253,272.08/28,615
  6. Step 6: Final answer
    x = 29,748.50

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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.