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Finding the Fourth Proportional to 706.12, 1,059.36 and 219.20

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Solution

The fourth proportional to 706.12, 1,059.36 and 219.20 is: 328.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    706.12 : 1,059.36 = 219.20 : x
  2. Step 2: Convert to fraction form
    706.12/1,059.36 = 219.20/x
  3. Step 3: Cross multiply
    706.12x = 1,059.36 × 219.20
  4. Step 4: Simplify right side
    706.12x = 232,211.71
  5. Step 5: Solve for x
    x = 232,211.71/706.12
  6. Step 6: Final answer
    x = 328.86

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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.