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Finding the Fourth Proportional to 397.55, 548.62 and 297.78

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Solution

The fourth proportional to 397.55, 548.62 and 297.78 is: 410.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    397.55 : 548.62 = 297.78 : x
  2. Step 2: Convert to fraction form
    397.55/548.62 = 297.78/x
  3. Step 3: Cross multiply
    397.55x = 548.62 × 297.78
  4. Step 4: Simplify right side
    397.55x = 163,369.38
  5. Step 5: Solve for x
    x = 163,369.38/397.55
  6. Step 6: Final answer
    x = 410.95

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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.