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Finding the Fourth Proportional to 1,219.42, 1,829.15 and 397.69

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Solution

The fourth proportional to 1,219.42, 1,829.15 and 397.69 is: 596.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,219.42 : 1,829.15 = 397.69 : x
  2. Step 2: Convert to fraction form
    1,219.42/1,829.15 = 397.69/x
  3. Step 3: Cross multiply
    1,219.42x = 1,829.15 × 397.69
  4. Step 4: Simplify right side
    1,219.42x = 727,434.66
  5. Step 5: Solve for x
    x = 727,434.66/1,219.42
  6. Step 6: Final answer
    x = 596.54

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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.