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Finding the Fourth Proportional to 706.72, 1,060.20 and 219.64

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Solution

The fourth proportional to 706.72, 1,060.20 and 219.64 is: 329.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    706.72 : 1,060.20 = 219.64 : x
  2. Step 2: Convert to fraction form
    706.72/1,060.20 = 219.64/x
  3. Step 3: Cross multiply
    706.72x = 1,060.20 × 219.64
  4. Step 4: Simplify right side
    706.72x = 232,862.33
  5. Step 5: Solve for x
    x = 232,862.33/706.72
  6. Step 6: Final answer
    x = 329.50

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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.