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Finding the Fourth Proportional to 13,640.74, 18,812.73 and 8,603.62

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Solution

The fourth proportional to 13,640.74, 18,812.73 and 8,603.62 is: 11,865.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,640.74 : 18,812.73 = 8,603.62 : x
  2. Step 2: Convert to fraction form
    13,640.74/18,812.73 = 8,603.62/x
  3. Step 3: Cross multiply
    13,640.74x = 18,812.73 × 8,603.62
  4. Step 4: Simplify right side
    13,640.74x = 161,857,580.08
  5. Step 5: Solve for x
    x = 161,857,580.08/13,640.74
  6. Step 6: Final answer
    x = 11,865.75

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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.