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Finding the Fourth Proportional to 386.37, 579.15 and 142.83

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Solution

The fourth proportional to 386.37, 579.15 and 142.83 is: 214.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.37 : 579.15 = 142.83 : x
  2. Step 2: Convert to fraction form
    386.37/579.15 = 142.83/x
  3. Step 3: Cross multiply
    386.37x = 579.15 × 142.83
  4. Step 4: Simplify right side
    386.37x = 82,719.99
  5. Step 5: Solve for x
    x = 82,719.99/386.37
  6. Step 6: Final answer
    x = 214.10

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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.