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Finding the Fourth Proportional to 674.71, 1,012.08 and 445.07

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Solution

The fourth proportional to 674.71, 1,012.08 and 445.07 is: 667.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    674.71 : 1,012.08 = 445.07 : x
  2. Step 2: Convert to fraction form
    674.71/1,012.08 = 445.07/x
  3. Step 3: Cross multiply
    674.71x = 1,012.08 × 445.07
  4. Step 4: Simplify right side
    674.71x = 450,444.22
  5. Step 5: Solve for x
    x = 450,444.22/674.71
  6. Step 6: Final answer
    x = 667.61

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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.