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Finding the Fourth Proportional to 2,980, 4,470.68 and 1,225

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Solution

The fourth proportional to 2,980, 4,470.68 and 1,225 is: 1,837.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,980 : 4,470.68 = 1,225 : x
  2. Step 2: Convert to fraction form
    2,980/4,470.68 = 1,225/x
  3. Step 3: Cross multiply
    2,980x = 4,470.68 × 1,225
  4. Step 4: Simplify right side
    2,980x = 5,476,583
  5. Step 5: Solve for x
    x = 5,476,583/2,980
  6. Step 6: Final answer
    x = 1,837.78

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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.