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Finding the Fourth Proportional to 309.91, 427.30 and 266.17

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Solution

The fourth proportional to 309.91, 427.30 and 266.17 is: 366.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.91 : 427.30 = 266.17 : x
  2. Step 2: Convert to fraction form
    309.91/427.30 = 266.17/x
  3. Step 3: Cross multiply
    309.91x = 427.30 × 266.17
  4. Step 4: Simplify right side
    309.91x = 113,734.44
  5. Step 5: Solve for x
    x = 113,734.44/309.91
  6. Step 6: Final answer
    x = 366.99

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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.