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Finding the Fourth Proportional to 808.69, 1,114.81 and 668.56

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Solution

The fourth proportional to 808.69, 1,114.81 and 668.56 is: 921.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    808.69 : 1,114.81 = 668.56 : x
  2. Step 2: Convert to fraction form
    808.69/1,114.81 = 668.56/x
  3. Step 3: Cross multiply
    808.69x = 1,114.81 × 668.56
  4. Step 4: Simplify right side
    808.69x = 745,317.37
  5. Step 5: Solve for x
    x = 745,317.37/808.69
  6. Step 6: Final answer
    x = 921.64

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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.