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Finding the Fourth Proportional to 28,190.70, 42,257.70 and 14,129.10

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Solution

The fourth proportional to 28,190.70, 42,257.70 and 14,129.10 is: 21,179.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,190.70 : 42,257.70 = 14,129.10 : x
  2. Step 2: Convert to fraction form
    28,190.70/42,257.70 = 14,129.10/x
  3. Step 3: Cross multiply
    28,190.70x = 42,257.70 × 14,129.10
  4. Step 4: Simplify right side
    28,190.70x = 597,063,269.07
  5. Step 5: Solve for x
    x = 597,063,269.07/28,190.70
  6. Step 6: Final answer
    x = 21,179.44

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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.