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Finding the Fourth Proportional to 1,072.99, 1,609.55 and 415.18

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Solution

The fourth proportional to 1,072.99, 1,609.55 and 415.18 is: 622.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,072.99 : 1,609.55 = 415.18 : x
  2. Step 2: Convert to fraction form
    1,072.99/1,609.55 = 415.18/x
  3. Step 3: Cross multiply
    1,072.99x = 1,609.55 × 415.18
  4. Step 4: Simplify right side
    1,072.99x = 668,252.97
  5. Step 5: Solve for x
    x = 668,252.97/1,072.99
  6. Step 6: Final answer
    x = 622.80

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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.