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Finding the Fourth Proportional to 18,614.80, 27,931.65 and 12,379.15

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Solution

The fourth proportional to 18,614.80, 27,931.65 and 12,379.15 is: 18,575.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,614.80 : 27,931.65 = 12,379.15 : x
  2. Step 2: Convert to fraction form
    18,614.80/27,931.65 = 12,379.15/x
  3. Step 3: Cross multiply
    18,614.80x = 27,931.65 × 12,379.15
  4. Step 4: Simplify right side
    18,614.80x = 345,770,085.10
  5. Step 5: Solve for x
    x = 345,770,085.10/18,614.80
  6. Step 6: Final answer
    x = 18,575.01

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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.