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Finding the Fourth Proportional to 670.44, 1,005.72 and 427.44

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Solution

The fourth proportional to 670.44, 1,005.72 and 427.44 is: 641.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    670.44 : 1,005.72 = 427.44 : x
  2. Step 2: Convert to fraction form
    670.44/1,005.72 = 427.44/x
  3. Step 3: Cross multiply
    670.44x = 1,005.72 × 427.44
  4. Step 4: Simplify right side
    670.44x = 429,884.96
  5. Step 5: Solve for x
    x = 429,884.96/670.44
  6. Step 6: Final answer
    x = 641.20

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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.