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Finding the Fourth Proportional to 18,121.98, 27,142.80 and 13,931.16

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Solution

The fourth proportional to 18,121.98, 27,142.80 and 13,931.16 is: 20,865.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,121.98 : 27,142.80 = 13,931.16 : x
  2. Step 2: Convert to fraction form
    18,121.98/27,142.80 = 13,931.16/x
  3. Step 3: Cross multiply
    18,121.98x = 27,142.80 × 13,931.16
  4. Step 4: Simplify right side
    18,121.98x = 378,130,689.65
  5. Step 5: Solve for x
    x = 378,130,689.65/18,121.98
  6. Step 6: Final answer
    x = 20,865.86

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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.