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Finding the Fourth Proportional to 385.69, 531.83 and 261.13

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Solution

The fourth proportional to 385.69, 531.83 and 261.13 is: 360.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.69 : 531.83 = 261.13 : x
  2. Step 2: Convert to fraction form
    385.69/531.83 = 261.13/x
  3. Step 3: Cross multiply
    385.69x = 531.83 × 261.13
  4. Step 4: Simplify right side
    385.69x = 138,876.77
  5. Step 5: Solve for x
    x = 138,876.77/385.69
  6. Step 6: Final answer
    x = 360.07

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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.