Home / 20,991.56-31,457.72-11,635.75

Finding the Fourth Proportional to 20,991.56, 31,457.72 and 11,635.75

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Solution

The fourth proportional to 20,991.56, 31,457.72 and 11,635.75 is: 17,437.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,991.56 : 31,457.72 = 11,635.75 : x
  2. Step 2: Convert to fraction form
    20,991.56/31,457.72 = 11,635.75/x
  3. Step 3: Cross multiply
    20,991.56x = 31,457.72 × 11,635.75
  4. Step 4: Simplify right side
    20,991.56x = 366,034,168.45
  5. Step 5: Solve for x
    x = 366,034,168.45/20,991.56
  6. Step 6: Final answer
    x = 17,437.21

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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.