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Finding the Fourth Proportional to 13,405.20, 20,085 and 8,718.05

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Solution

The fourth proportional to 13,405.20, 20,085 and 8,718.05 is: 13,062.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,405.20 : 20,085 = 8,718.05 : x
  2. Step 2: Convert to fraction form
    13,405.20/20,085 = 8,718.05/x
  3. Step 3: Cross multiply
    13,405.20x = 20,085 × 8,718.05
  4. Step 4: Simplify right side
    13,405.20x = 175,101,933.83
  5. Step 5: Solve for x
    x = 175,101,933.83/13,405.20
  6. Step 6: Final answer
    x = 13,062.24

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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.