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Finding the Fourth Proportional to 911.42, 1,257.86 and 518.38

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Solution

The fourth proportional to 911.42, 1,257.86 and 518.38 is: 715.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.42 : 1,257.86 = 518.38 : x
  2. Step 2: Convert to fraction form
    911.42/1,257.86 = 518.38/x
  3. Step 3: Cross multiply
    911.42x = 1,257.86 × 518.38
  4. Step 4: Simplify right side
    911.42x = 652,049.47
  5. Step 5: Solve for x
    x = 652,049.47/911.42
  6. Step 6: Final answer
    x = 715.42

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1.5x scale

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.