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Finding the Fourth Proportional to 395.37, 545.80 and 306.65

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Solution

The fourth proportional to 395.37, 545.80 and 306.65 is: 423.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    395.37 : 545.80 = 306.65 : x
  2. Step 2: Convert to fraction form
    395.37/545.80 = 306.65/x
  3. Step 3: Cross multiply
    395.37x = 545.80 × 306.65
  4. Step 4: Simplify right side
    395.37x = 167,367.22
  5. Step 5: Solve for x
    x = 167,367.22/395.37
  6. Step 6: Final answer
    x = 423.32

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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.