Home / 13,785.60-20,686.91-6,388.68

Finding the Fourth Proportional to 13,785.60, 20,686.91 and 6,388.68

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Solution

The fourth proportional to 13,785.60, 20,686.91 and 6,388.68 is: 9,586.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,785.60 : 20,686.91 = 6,388.68 : x
  2. Step 2: Convert to fraction form
    13,785.60/20,686.91 = 6,388.68/x
  3. Step 3: Cross multiply
    13,785.60x = 20,686.91 × 6,388.68
  4. Step 4: Simplify right side
    13,785.60x = 132,162,016.24
  5. Step 5: Solve for x
    x = 132,162,016.24/13,785.60
  6. Step 6: Final answer
    x = 9,586.96

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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.