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Finding the Fourth Proportional to 369.40, 553.43 and 266.19

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Solution

The fourth proportional to 369.40, 553.43 and 266.19 is: 398.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    369.40 : 553.43 = 266.19 : x
  2. Step 2: Convert to fraction form
    369.40/553.43 = 266.19/x
  3. Step 3: Cross multiply
    369.40x = 553.43 × 266.19
  4. Step 4: Simplify right side
    369.40x = 147,317.53
  5. Step 5: Solve for x
    x = 147,317.53/369.40
  6. Step 6: Final answer
    x = 398.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.