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Finding the Fourth Proportional to 386.51, 533.05 and 261.92

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Solution

The fourth proportional to 386.51, 533.05 and 261.92 is: 361.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.51 : 533.05 = 261.92 : x
  2. Step 2: Convert to fraction form
    386.51/533.05 = 261.92/x
  3. Step 3: Cross multiply
    386.51x = 533.05 × 261.92
  4. Step 4: Simplify right side
    386.51x = 139,617.13
  5. Step 5: Solve for x
    x = 139,617.13/386.51
  6. Step 6: Final answer
    x = 361.23

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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.