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Finding the Fourth Proportional to 266.51, 396.38 and 261.05

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Solution

The fourth proportional to 266.51, 396.38 and 261.05 is: 388.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    266.51 : 396.38 = 261.05 : x
  2. Step 2: Convert to fraction form
    266.51/396.38 = 261.05/x
  3. Step 3: Cross multiply
    266.51x = 396.38 × 261.05
  4. Step 4: Simplify right side
    266.51x = 103,473.67
  5. Step 5: Solve for x
    x = 103,473.67/266.51
  6. Step 6: Final answer
    x = 388.25

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.