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Finding the Fourth Proportional to 395.45, 545.70 and 229.64

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Solution

The fourth proportional to 395.45, 545.70 and 229.64 is: 316.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    395.45 : 545.70 = 229.64 : x
  2. Step 2: Convert to fraction form
    395.45/545.70 = 229.64/x
  3. Step 3: Cross multiply
    395.45x = 545.70 × 229.64
  4. Step 4: Simplify right side
    395.45x = 125,314.55
  5. Step 5: Solve for x
    x = 125,314.55/395.45
  6. Step 6: Final answer
    x = 316.89

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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.