Home / 20,861.23-31,282.48-12,431.71

Finding the Fourth Proportional to 20,861.23, 31,282.48 and 12,431.71

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Solution

The fourth proportional to 20,861.23, 31,282.48 and 12,431.71 is: 18,641.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,861.23 : 31,282.48 = 12,431.71 : x
  2. Step 2: Convert to fraction form
    20,861.23/31,282.48 = 12,431.71/x
  3. Step 3: Cross multiply
    20,861.23x = 31,282.48 × 12,431.71
  4. Step 4: Simplify right side
    20,861.23x = 388,894,719.44
  5. Step 5: Solve for x
    x = 388,894,719.44/20,861.23
  6. Step 6: Final answer
    x = 18,641.98

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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.