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Finding the Fourth Proportional to 13,640.62, 20,460.74 and 7,440.13

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Solution

The fourth proportional to 13,640.62, 20,460.74 and 7,440.13 is: 11,160.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,640.62 : 20,460.74 = 7,440.13 : x
  2. Step 2: Convert to fraction form
    13,640.62/20,460.74 = 7,440.13/x
  3. Step 3: Cross multiply
    13,640.62x = 20,460.74 × 7,440.13
  4. Step 4: Simplify right side
    13,640.62x = 152,230,532.94
  5. Step 5: Solve for x
    x = 152,230,532.94/13,640.62
  6. Step 6: Final answer
    x = 11,160.09

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.