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Finding the Fourth Proportional to 401.50, 553.89 and 277.21

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Solution

The fourth proportional to 401.50, 553.89 and 277.21 is: 382.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    401.50 : 553.89 = 277.21 : x
  2. Step 2: Convert to fraction form
    401.50/553.89 = 277.21/x
  3. Step 3: Cross multiply
    401.50x = 553.89 × 277.21
  4. Step 4: Simplify right side
    401.50x = 153,543.85
  5. Step 5: Solve for x
    x = 153,543.85/401.50
  6. Step 6: Final answer
    x = 382.43

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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.