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Finding the Fourth Proportional to 670.85, 1,007.42 and 636.23

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Solution

The fourth proportional to 670.85, 1,007.42 and 636.23 is: 955.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    670.85 : 1,007.42 = 636.23 : x
  2. Step 2: Convert to fraction form
    670.85/1,007.42 = 636.23/x
  3. Step 3: Cross multiply
    670.85x = 1,007.42 × 636.23
  4. Step 4: Simplify right side
    670.85x = 640,942.61
  5. Step 5: Solve for x
    x = 640,942.61/670.85
  6. Step 6: Final answer
    x = 955.43

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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.