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Finding the Fourth Proportional to 670.97, 1,006.05 and 378.34

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Solution

The fourth proportional to 670.97, 1,006.05 and 378.34 is: 567.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    670.97 : 1,006.05 = 378.34 : x
  2. Step 2: Convert to fraction form
    670.97/1,006.05 = 378.34/x
  3. Step 3: Cross multiply
    670.97x = 1,006.05 × 378.34
  4. Step 4: Simplify right side
    670.97x = 380,627.86
  5. Step 5: Solve for x
    x = 380,627.86/670.97
  6. Step 6: Final answer
    x = 567.28

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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.