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Finding the Fourth Proportional to 386.74, 579.99 and 155.55

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Solution

The fourth proportional to 386.74, 579.99 and 155.55 is: 233.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.74 : 579.99 = 155.55 : x
  2. Step 2: Convert to fraction form
    386.74/579.99 = 155.55/x
  3. Step 3: Cross multiply
    386.74x = 579.99 × 155.55
  4. Step 4: Simplify right side
    386.74x = 90,217.44
  5. Step 5: Solve for x
    x = 90,217.44/386.74
  6. Step 6: Final answer
    x = 233.28

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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.