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Finding the Fourth Proportional to 18,306.78, 25,263 and 12,018.78

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Solution

The fourth proportional to 18,306.78, 25,263 and 12,018.78 is: 16,585.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,306.78 : 25,263 = 12,018.78 : x
  2. Step 2: Convert to fraction form
    18,306.78/25,263 = 12,018.78/x
  3. Step 3: Cross multiply
    18,306.78x = 25,263 × 12,018.78
  4. Step 4: Simplify right side
    18,306.78x = 303,630,439.14
  5. Step 5: Solve for x
    x = 303,630,439.14/18,306.78
  6. Step 6: Final answer
    x = 16,585.68

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.