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Finding the Fourth Proportional to 18,619.20, 25,687.20 and 10,657.20

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Solution

The fourth proportional to 18,619.20, 25,687.20 and 10,657.20 is: 14,702.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,619.20 : 25,687.20 = 10,657.20 : x
  2. Step 2: Convert to fraction form
    18,619.20/25,687.20 = 10,657.20/x
  3. Step 3: Cross multiply
    18,619.20x = 25,687.20 × 10,657.20
  4. Step 4: Simplify right side
    18,619.20x = 273,753,627.84
  5. Step 5: Solve for x
    x = 273,753,627.84/18,619.20
  6. Step 6: Final answer
    x = 14,702.76

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.