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Finding the Fourth Proportional to 18,275.40, 27,369.90 and 12,400.20

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Solution

The fourth proportional to 18,275.40, 27,369.90 and 12,400.20 is: 18,570.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,275.40 : 27,369.90 = 12,400.20 : x
  2. Step 2: Convert to fraction form
    18,275.40/27,369.90 = 12,400.20/x
  3. Step 3: Cross multiply
    18,275.40x = 27,369.90 × 12,400.20
  4. Step 4: Simplify right side
    18,275.40x = 339,392,233.98
  5. Step 5: Solve for x
    x = 339,392,233.98/18,275.40
  6. Step 6: Final answer
    x = 18,570.99

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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.