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Finding the Fourth Proportional to 395.32, 545.53 and 220.66

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Solution

The fourth proportional to 395.32, 545.53 and 220.66 is: 304.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    395.32 : 545.53 = 220.66 : x
  2. Step 2: Convert to fraction form
    395.32/545.53 = 220.66/x
  3. Step 3: Cross multiply
    395.32x = 545.53 × 220.66
  4. Step 4: Simplify right side
    395.32x = 120,376.65
  5. Step 5: Solve for x
    x = 120,376.65/395.32
  6. Step 6: Final answer
    x = 304.50

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.