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Finding the Fourth Proportional to 386.69, 579.86 and 240.43

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Solution

The fourth proportional to 386.69, 579.86 and 240.43 is: 360.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.69 : 579.86 = 240.43 : x
  2. Step 2: Convert to fraction form
    386.69/579.86 = 240.43/x
  3. Step 3: Cross multiply
    386.69x = 579.86 × 240.43
  4. Step 4: Simplify right side
    386.69x = 139,415.74
  5. Step 5: Solve for x
    x = 139,415.74/386.69
  6. Step 6: Final answer
    x = 360.54

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.