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Finding the Fourth Proportional to 13,371.72, 20,086.59 and 10,455.72

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Solution

The fourth proportional to 13,371.72, 20,086.59 and 10,455.72 is: 15,706.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,371.72 : 20,086.59 = 10,455.72 : x
  2. Step 2: Convert to fraction form
    13,371.72/20,086.59 = 10,455.72/x
  3. Step 3: Cross multiply
    13,371.72x = 20,086.59 × 10,455.72
  4. Step 4: Simplify right side
    13,371.72x = 210,019,760.79
  5. Step 5: Solve for x
    x = 210,019,760.79/13,371.72
  6. Step 6: Final answer
    x = 15,706.26

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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.