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Finding the Fourth Proportional to 386.37, 533.21 and 261.81

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Solution

The fourth proportional to 386.37, 533.21 and 261.81 is: 361.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.37 : 533.21 = 261.81 : x
  2. Step 2: Convert to fraction form
    386.37/533.21 = 261.81/x
  3. Step 3: Cross multiply
    386.37x = 533.21 × 261.81
  4. Step 4: Simplify right side
    386.37x = 139,598.40
  5. Step 5: Solve for x
    x = 139,598.40/386.37
  6. Step 6: Final answer
    x = 361.31

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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.