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Finding the Fourth Proportional to 674.93, 1,012.91 and 415.33

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Solution

The fourth proportional to 674.93, 1,012.91 and 415.33 is: 623.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    674.93 : 1,012.91 = 415.33 : x
  2. Step 2: Convert to fraction form
    674.93/1,012.91 = 415.33/x
  3. Step 3: Cross multiply
    674.93x = 1,012.91 × 415.33
  4. Step 4: Simplify right side
    674.93x = 420,687.30
  5. Step 5: Solve for x
    x = 420,687.30/674.93
  6. Step 6: Final answer
    x = 623.30

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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.