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Finding the Fourth Proportional to 668.57, 1,007.87 and 623.97

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Solution

The fourth proportional to 668.57, 1,007.87 and 623.97 is: 940.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.57 : 1,007.87 = 623.97 : x
  2. Step 2: Convert to fraction form
    668.57/1,007.87 = 623.97/x
  3. Step 3: Cross multiply
    668.57x = 1,007.87 × 623.97
  4. Step 4: Simplify right side
    668.57x = 628,877.52
  5. Step 5: Solve for x
    x = 628,877.52/668.57
  6. Step 6: Final answer
    x = 940.64

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.