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Finding the Fourth Proportional to 395.51, 545.72 and 229.74

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Solution

The fourth proportional to 395.51, 545.72 and 229.74 is: 316.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    395.51 : 545.72 = 229.74 : x
  2. Step 2: Convert to fraction form
    395.51/545.72 = 229.74/x
  3. Step 3: Cross multiply
    395.51x = 545.72 × 229.74
  4. Step 4: Simplify right side
    395.51x = 125,372.56
  5. Step 5: Solve for x
    x = 125,372.56/395.51
  6. Step 6: Final answer
    x = 316.99

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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.