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Finding the Fourth Proportional to 911.64, 1,257.91 and 518.59

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Solution

The fourth proportional to 911.64, 1,257.91 and 518.59 is: 715.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.64 : 1,257.91 = 518.59 : x
  2. Step 2: Convert to fraction form
    911.64/1,257.91 = 518.59/x
  3. Step 3: Cross multiply
    911.64x = 1,257.91 × 518.59
  4. Step 4: Simplify right side
    911.64x = 652,335.11
  5. Step 5: Solve for x
    x = 652,335.11/911.64
  6. Step 6: Final answer
    x = 715.56

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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.