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Finding the Fourth Proportional to 386.61, 579.93 and 191.70

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Solution

The fourth proportional to 386.61, 579.93 and 191.70 is: 287.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.61 : 579.93 = 191.70 : x
  2. Step 2: Convert to fraction form
    386.61/579.93 = 191.70/x
  3. Step 3: Cross multiply
    386.61x = 579.93 × 191.70
  4. Step 4: Simplify right side
    386.61x = 111,171.86
  5. Step 5: Solve for x
    x = 111,171.86/386.61
  6. Step 6: Final answer
    x = 287.56

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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.