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Finding the Fourth Proportional to 672.06, 1,007.85 and 221.07

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Solution

The fourth proportional to 672.06, 1,007.85 and 221.07 is: 331.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.06 : 1,007.85 = 221.07 : x
  2. Step 2: Convert to fraction form
    672.06/1,007.85 = 221.07/x
  3. Step 3: Cross multiply
    672.06x = 1,007.85 × 221.07
  4. Step 4: Simplify right side
    672.06x = 222,805.40
  5. Step 5: Solve for x
    x = 222,805.40/672.06
  6. Step 6: Final answer
    x = 331.53

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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.