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Finding the Fourth Proportional to 671.28, 1,006.80 and 427.08

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Solution

The fourth proportional to 671.28, 1,006.80 and 427.08 is: 640.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.28 : 1,006.80 = 427.08 : x
  2. Step 2: Convert to fraction form
    671.28/1,006.80 = 427.08/x
  3. Step 3: Cross multiply
    671.28x = 1,006.80 × 427.08
  4. Step 4: Simplify right side
    671.28x = 429,984.14
  5. Step 5: Solve for x
    x = 429,984.14/671.28
  6. Step 6: Final answer
    x = 640.54

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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.