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Finding the Fourth Proportional to 18,438.40, 27,614.40 and 12,563.20

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Solution

The fourth proportional to 18,438.40, 27,614.40 and 12,563.20 is: 18,815.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,438.40 : 27,614.40 = 12,563.20 : x
  2. Step 2: Convert to fraction form
    18,438.40/27,614.40 = 12,563.20/x
  3. Step 3: Cross multiply
    18,438.40x = 27,614.40 × 12,563.20
  4. Step 4: Simplify right side
    18,438.40x = 346,925,230.08
  5. Step 5: Solve for x
    x = 346,925,230.08/18,438.40
  6. Step 6: Final answer
    x = 18,815.37

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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.