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Finding the Fourth Proportional to 28,129.80, 42,165.90 and 15,630.60

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Solution

The fourth proportional to 28,129.80, 42,165.90 and 15,630.60 is: 23,429.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,129.80 : 42,165.90 = 15,630.60 : x
  2. Step 2: Convert to fraction form
    28,129.80/42,165.90 = 15,630.60/x
  3. Step 3: Cross multiply
    28,129.80x = 42,165.90 × 15,630.60
  4. Step 4: Simplify right side
    28,129.80x = 659,078,316.54
  5. Step 5: Solve for x
    x = 659,078,316.54/28,129.80
  6. Step 6: Final answer
    x = 23,429.90

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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.