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Finding the Fourth Proportional to 671.66, 1,006.38 and 427.64

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Solution

The fourth proportional to 671.66, 1,006.38 and 427.64 is: 640.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.66 : 1,006.38 = 427.64 : x
  2. Step 2: Convert to fraction form
    671.66/1,006.38 = 427.64/x
  3. Step 3: Cross multiply
    671.66x = 1,006.38 × 427.64
  4. Step 4: Simplify right side
    671.66x = 430,368.34
  5. Step 5: Solve for x
    x = 430,368.34/671.66
  6. Step 6: Final answer
    x = 640.75

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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.