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Finding the Fourth Proportional to 657.86, 908.34 and 518.66

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Solution

The fourth proportional to 657.86, 908.34 and 518.66 is: 716.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    657.86 : 908.34 = 518.66 : x
  2. Step 2: Convert to fraction form
    657.86/908.34 = 518.66/x
  3. Step 3: Cross multiply
    657.86x = 908.34 × 518.66
  4. Step 4: Simplify right side
    657.86x = 471,119.62
  5. Step 5: Solve for x
    x = 471,119.62/657.86
  6. Step 6: Final answer
    x = 716.14

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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.