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Finding the Fourth Proportional to 668.66, 1,001.79 and 408.53

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Solution

The fourth proportional to 668.66, 1,001.79 and 408.53 is: 612.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.66 : 1,001.79 = 408.53 : x
  2. Step 2: Convert to fraction form
    668.66/1,001.79 = 408.53/x
  3. Step 3: Cross multiply
    668.66x = 1,001.79 × 408.53
  4. Step 4: Simplify right side
    668.66x = 409,256.26
  5. Step 5: Solve for x
    x = 409,256.26/668.66
  6. Step 6: Final answer
    x = 612.06

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.