Home / 20,861.28-31,321.04-19,908.64

Finding the Fourth Proportional to 20,861.28, 31,321.04 and 19,908.64

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Solution

The fourth proportional to 20,861.28, 31,321.04 and 19,908.64 is: 29,890.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,861.28 : 31,321.04 = 19,908.64 : x
  2. Step 2: Convert to fraction form
    20,861.28/31,321.04 = 19,908.64/x
  3. Step 3: Cross multiply
    20,861.28x = 31,321.04 × 19,908.64
  4. Step 4: Simplify right side
    20,861.28x = 623,559,309.79
  5. Step 5: Solve for x
    x = 623,559,309.79/20,861.28
  6. Step 6: Final answer
    x = 29,890.75

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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.