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Finding the Fourth Proportional to 397.75, 549.30 and 395.05

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Solution

The fourth proportional to 397.75, 549.30 and 395.05 is: 545.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    397.75 : 549.30 = 395.05 : x
  2. Step 2: Convert to fraction form
    397.75/549.30 = 395.05/x
  3. Step 3: Cross multiply
    397.75x = 549.30 × 395.05
  4. Step 4: Simplify right side
    397.75x = 217,000.97
  5. Step 5: Solve for x
    x = 217,000.97/397.75
  6. Step 6: Final answer
    x = 545.57

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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.