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Finding the Fourth Proportional to 386.60, 579.62 and 213.08

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Solution

The fourth proportional to 386.60, 579.62 and 213.08 is: 319.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.60 : 579.62 = 213.08 : x
  2. Step 2: Convert to fraction form
    386.60/579.62 = 213.08/x
  3. Step 3: Cross multiply
    386.60x = 579.62 × 213.08
  4. Step 4: Simplify right side
    386.60x = 123,503.06
  5. Step 5: Solve for x
    x = 123,503.06/386.60
  6. Step 6: Final answer
    x = 319.46

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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.