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Finding the Fourth Proportional to 397.62, 548.90 and 266.72

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Solution

The fourth proportional to 397.62, 548.90 and 266.72 is: 368.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    397.62 : 548.90 = 266.72 : x
  2. Step 2: Convert to fraction form
    397.62/548.90 = 266.72/x
  3. Step 3: Cross multiply
    397.62x = 548.90 × 266.72
  4. Step 4: Simplify right side
    397.62x = 146,402.61
  5. Step 5: Solve for x
    x = 146,402.61/397.62
  6. Step 6: Final answer
    x = 368.20

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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.