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Finding the Fourth Proportional to 707.45, 1,061.21 and 220.44

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Solution

The fourth proportional to 707.45, 1,061.21 and 220.44 is: 330.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    707.45 : 1,061.21 = 220.44 : x
  2. Step 2: Convert to fraction form
    707.45/1,061.21 = 220.44/x
  3. Step 3: Cross multiply
    707.45x = 1,061.21 × 220.44
  4. Step 4: Simplify right side
    707.45x = 233,926.72
  5. Step 5: Solve for x
    x = 233,926.72/707.45
  6. Step 6: Final answer
    x = 330.66

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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.