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Finding the Fourth Proportional to 18,640.89, 25,724.54 and 10,143.07

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Solution

The fourth proportional to 18,640.89, 25,724.54 and 10,143.07 is: 13,997.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,640.89 : 25,724.54 = 10,143.07 : x
  2. Step 2: Convert to fraction form
    18,640.89/25,724.54 = 10,143.07/x
  3. Step 3: Cross multiply
    18,640.89x = 25,724.54 × 10,143.07
  4. Step 4: Simplify right side
    18,640.89x = 260,925,858.63
  5. Step 5: Solve for x
    x = 260,925,858.63/18,640.89
  6. Step 6: Final answer
    x = 13,997.50

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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.