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Finding the Fourth Proportional to 18,640.96, 25,724.08 and 10,687.84

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Solution

The fourth proportional to 18,640.96, 25,724.08 and 10,687.84 is: 14,748.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,640.96 : 25,724.08 = 10,687.84 : x
  2. Step 2: Convert to fraction form
    18,640.96/25,724.08 = 10,687.84/x
  3. Step 3: Cross multiply
    18,640.96x = 25,724.08 × 10,687.84
  4. Step 4: Simplify right side
    18,640.96x = 274,934,851.19
  5. Step 5: Solve for x
    x = 274,934,851.19/18,640.96
  6. Step 6: Final answer
    x = 14,748.96

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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.