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Finding the Fourth Proportional to 13,812.40, 20,718.60 and 7,240.60

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Solution

The fourth proportional to 13,812.40, 20,718.60 and 7,240.60 is: 10,860.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,812.40 : 20,718.60 = 7,240.60 : x
  2. Step 2: Convert to fraction form
    13,812.40/20,718.60 = 7,240.60/x
  3. Step 3: Cross multiply
    13,812.40x = 20,718.60 × 7,240.60
  4. Step 4: Simplify right side
    13,812.40x = 150,015,095.16
  5. Step 5: Solve for x
    x = 150,015,095.16/13,812.40
  6. Step 6: Final answer
    x = 10,860.90

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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.