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Finding the Fourth Proportional to 395.47, 545.80 and 229.78

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Solution

The fourth proportional to 395.47, 545.80 and 229.78 is: 317.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    395.47 : 545.80 = 229.78 : x
  2. Step 2: Convert to fraction form
    395.47/545.80 = 229.78/x
  3. Step 3: Cross multiply
    395.47x = 545.80 × 229.78
  4. Step 4: Simplify right side
    395.47x = 125,411.99
  5. Step 5: Solve for x
    x = 125,411.99/395.47
  6. Step 6: Final answer
    x = 317.12

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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.