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Finding the Fourth Proportional to 397.56, 548.60 and 314.87

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Solution

The fourth proportional to 397.56, 548.60 and 314.87 is: 434.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    397.56 : 548.60 = 314.87 : x
  2. Step 2: Convert to fraction form
    397.56/548.60 = 314.87/x
  3. Step 3: Cross multiply
    397.56x = 548.60 × 314.87
  4. Step 4: Simplify right side
    397.56x = 172,737.48
  5. Step 5: Solve for x
    x = 172,737.48/397.56
  6. Step 6: Final answer
    x = 434.49

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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.