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Finding the Fourth Proportional to 18,640.52, 25,724.40 and 10,143.18

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Solution

The fourth proportional to 18,640.52, 25,724.40 and 10,143.18 is: 13,997.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,640.52 : 25,724.40 = 10,143.18 : x
  2. Step 2: Convert to fraction form
    18,640.52/25,724.40 = 10,143.18/x
  3. Step 3: Cross multiply
    18,640.52x = 25,724.40 × 10,143.18
  4. Step 4: Simplify right side
    18,640.52x = 260,927,219.59
  5. Step 5: Solve for x
    x = 260,927,219.59/18,640.52
  6. Step 6: Final answer
    x = 13,997.85

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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.