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Finding the Fourth Proportional to 1,234.75, 1,851.66 and 412.90

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Solution

The fourth proportional to 1,234.75, 1,851.66 and 412.90 is: 619.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,234.75 : 1,851.66 = 412.90 : x
  2. Step 2: Convert to fraction form
    1,234.75/1,851.66 = 412.90/x
  3. Step 3: Cross multiply
    1,234.75x = 1,851.66 × 412.90
  4. Step 4: Simplify right side
    1,234.75x = 764,550.41
  5. Step 5: Solve for x
    x = 764,550.41/1,234.75
  6. Step 6: Final answer
    x = 619.19

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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.