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Finding the Fourth Proportional to 386.35, 579.48 and 97.79

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Solution

The fourth proportional to 386.35, 579.48 and 97.79 is: 146.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.35 : 579.48 = 97.79 : x
  2. Step 2: Convert to fraction form
    386.35/579.48 = 97.79/x
  3. Step 3: Cross multiply
    386.35x = 579.48 × 97.79
  4. Step 4: Simplify right side
    386.35x = 56,667.35
  5. Step 5: Solve for x
    x = 56,667.35/386.35
  6. Step 6: Final answer
    x = 146.68

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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.