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Finding the Fourth Proportional to 911.16, 1,257.63 and 518.31

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Solution

The fourth proportional to 911.16, 1,257.63 and 518.31 is: 715.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.16 : 1,257.63 = 518.31 : x
  2. Step 2: Convert to fraction form
    911.16/1,257.63 = 518.31/x
  3. Step 3: Cross multiply
    911.16x = 1,257.63 × 518.31
  4. Step 4: Simplify right side
    911.16x = 651,842.21
  5. Step 5: Solve for x
    x = 651,842.21/911.16
  6. Step 6: Final answer
    x = 715.40

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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.