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Finding the Fourth Proportional to 911.37, 1,257.53 and 512.92

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Solution

The fourth proportional to 911.37, 1,257.53 and 512.92 is: 707.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.37 : 1,257.53 = 512.92 : x
  2. Step 2: Convert to fraction form
    911.37/1,257.53 = 512.92/x
  3. Step 3: Cross multiply
    911.37x = 1,257.53 × 512.92
  4. Step 4: Simplify right side
    911.37x = 645,004.22
  5. Step 5: Solve for x
    x = 645,004.22/911.37
  6. Step 6: Final answer
    x = 707.73

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.