Home / 20,989.13-31,485.51-5,406.75

Finding the Fourth Proportional to 20,989.13, 31,485.51 and 5,406.75

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Solution

The fourth proportional to 20,989.13, 31,485.51 and 5,406.75 is: 8,110.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,989.13 : 31,485.51 = 5,406.75 : x
  2. Step 2: Convert to fraction form
    20,989.13/31,485.51 = 5,406.75/x
  3. Step 3: Cross multiply
    20,989.13x = 31,485.51 × 5,406.75
  4. Step 4: Simplify right side
    20,989.13x = 170,234,281.19
  5. Step 5: Solve for x
    x = 170,234,281.19/20,989.13
  6. Step 6: Final answer
    x = 8,110.59

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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.