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Finding the Fourth Proportional to 13,387.70, 20,081.25 and 4,621.79

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Solution

The fourth proportional to 13,387.70, 20,081.25 and 4,621.79 is: 6,932.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,387.70 : 20,081.25 = 4,621.79 : x
  2. Step 2: Convert to fraction form
    13,387.70/20,081.25 = 4,621.79/x
  3. Step 3: Cross multiply
    13,387.70x = 20,081.25 × 4,621.79
  4. Step 4: Simplify right side
    13,387.70x = 92,811,370.64
  5. Step 5: Solve for x
    x = 92,811,370.64/13,387.70
  6. Step 6: Final answer
    x = 6,932.58

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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.