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Finding the Fourth Proportional to 397.70, 549.42 and 314.54

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Solution

The fourth proportional to 397.70, 549.42 and 314.54 is: 434.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    397.70 : 549.42 = 314.54 : x
  2. Step 2: Convert to fraction form
    397.70/549.42 = 314.54/x
  3. Step 3: Cross multiply
    397.70x = 549.42 × 314.54
  4. Step 4: Simplify right side
    397.70x = 172,814.57
  5. Step 5: Solve for x
    x = 172,814.57/397.70
  6. Step 6: Final answer
    x = 434.53

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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.