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Finding the Fourth Proportional to 1,224.20, 1,837.20 and 762.65

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Solution

The fourth proportional to 1,224.20, 1,837.20 and 762.65 is: 1,144.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,224.20 : 1,837.20 = 762.65 : x
  2. Step 2: Convert to fraction form
    1,224.20/1,837.20 = 762.65/x
  3. Step 3: Cross multiply
    1,224.20x = 1,837.20 × 762.65
  4. Step 4: Simplify right side
    1,224.20x = 1,401,140.58
  5. Step 5: Solve for x
    x = 1,401,140.58/1,224.20
  6. Step 6: Final answer
    x = 1,144.54

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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.