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Finding the Fourth Proportional to 13,751.60, 20,621.24 and 3,888.56

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Solution

The fourth proportional to 13,751.60, 20,621.24 and 3,888.56 is: 5,831.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,751.60 : 20,621.24 = 3,888.56 : x
  2. Step 2: Convert to fraction form
    13,751.60/20,621.24 = 3,888.56/x
  3. Step 3: Cross multiply
    13,751.60x = 20,621.24 × 3,888.56
  4. Step 4: Simplify right side
    13,751.60x = 80,186,929.01
  5. Step 5: Solve for x
    x = 80,186,929.01/13,751.60
  6. Step 6: Final answer
    x = 5,831.10

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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.