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Finding the Fourth Proportional to 717.15, 1,074.71 and 408.07

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Solution

The fourth proportional to 717.15, 1,074.71 and 408.07 is: 611.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.15 : 1,074.71 = 408.07 : x
  2. Step 2: Convert to fraction form
    717.15/1,074.71 = 408.07/x
  3. Step 3: Cross multiply
    717.15x = 1,074.71 × 408.07
  4. Step 4: Simplify right side
    717.15x = 438,554.14
  5. Step 5: Solve for x
    x = 438,554.14/717.15
  6. Step 6: Final answer
    x = 611.52

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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.