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Finding the Fourth Proportional to 394.90, 545.10 and 229.18

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Solution

The fourth proportional to 394.90, 545.10 and 229.18 is: 316.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.90 : 545.10 = 229.18 : x
  2. Step 2: Convert to fraction form
    394.90/545.10 = 229.18/x
  3. Step 3: Cross multiply
    394.90x = 545.10 × 229.18
  4. Step 4: Simplify right side
    394.90x = 124,926.02
  5. Step 5: Solve for x
    x = 124,926.02/394.90
  6. Step 6: Final answer
    x = 316.35

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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.