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Finding the Fourth Proportional to 18,780.40, 28,138.20 and 12,203.20

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Solution

The fourth proportional to 18,780.40, 28,138.20 and 12,203.20 is: 18,283.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,780.40 : 28,138.20 = 12,203.20 : x
  2. Step 2: Convert to fraction form
    18,780.40/28,138.20 = 12,203.20/x
  3. Step 3: Cross multiply
    18,780.40x = 28,138.20 × 12,203.20
  4. Step 4: Simplify right side
    18,780.40x = 343,376,082.24
  5. Step 5: Solve for x
    x = 343,376,082.24/18,780.40
  6. Step 6: Final answer
    x = 18,283.75

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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.