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Finding the Fourth Proportional to 18,428.72, 27,621.20 and 10,621.40

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Solution

The fourth proportional to 18,428.72, 27,621.20 and 10,621.40 is: 15,919.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,428.72 : 27,621.20 = 10,621.40 : x
  2. Step 2: Convert to fraction form
    18,428.72/27,621.20 = 10,621.40/x
  3. Step 3: Cross multiply
    18,428.72x = 27,621.20 × 10,621.40
  4. Step 4: Simplify right side
    18,428.72x = 293,375,702.13
  5. Step 5: Solve for x
    x = 293,375,702.13/18,428.72
  6. Step 6: Final answer
    x = 15,919.49

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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.