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Finding the Fourth Proportional to 2,190.78, 3,286.08 and 630.72

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Solution

The fourth proportional to 2,190.78, 3,286.08 and 630.72 is: 946.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,190.78 : 3,286.08 = 630.72 : x
  2. Step 2: Convert to fraction form
    2,190.78/3,286.08 = 630.72/x
  3. Step 3: Cross multiply
    2,190.78x = 3,286.08 × 630.72
  4. Step 4: Simplify right side
    2,190.78x = 2,072,596.38
  5. Step 5: Solve for x
    x = 2,072,596.38/2,190.78
  6. Step 6: Final answer
    x = 946.05

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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.