Home / 20,720.89-31,081.56-11,355.81

Finding the Fourth Proportional to 20,720.89, 31,081.56 and 11,355.81

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Solution

The fourth proportional to 20,720.89, 31,081.56 and 11,355.81 is: 17,033.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,720.89 : 31,081.56 = 11,355.81 : x
  2. Step 2: Convert to fraction form
    20,720.89/31,081.56 = 11,355.81/x
  3. Step 3: Cross multiply
    20,720.89x = 31,081.56 × 11,355.81
  4. Step 4: Simplify right side
    20,720.89x = 352,956,289.86
  5. Step 5: Solve for x
    x = 352,956,289.86/20,720.89
  6. Step 6: Final answer
    x = 17,033.84

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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.