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Finding the Fourth Proportional to 385.81, 531.74 and 261.42

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Solution

The fourth proportional to 385.81, 531.74 and 261.42 is: 360.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.81 : 531.74 = 261.42 : x
  2. Step 2: Convert to fraction form
    385.81/531.74 = 261.42/x
  3. Step 3: Cross multiply
    385.81x = 531.74 × 261.42
  4. Step 4: Simplify right side
    385.81x = 139,007.47
  5. Step 5: Solve for x
    x = 139,007.47/385.81
  6. Step 6: Final answer
    x = 360.30

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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.