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Finding the Fourth Proportional to 386.75, 579.98 and 155.56

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Solution

The fourth proportional to 386.75, 579.98 and 155.56 is: 233.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.75 : 579.98 = 155.56 : x
  2. Step 2: Convert to fraction form
    386.75/579.98 = 155.56/x
  3. Step 3: Cross multiply
    386.75x = 579.98 × 155.56
  4. Step 4: Simplify right side
    386.75x = 90,219.46
  5. Step 5: Solve for x
    x = 90,219.46/386.75
  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.