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Finding the Fourth Proportional to 386.24, 578.83 and 212.70

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Solution

The fourth proportional to 386.24, 578.83 and 212.70 is: 318.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.24 : 578.83 = 212.70 : x
  2. Step 2: Convert to fraction form
    386.24/578.83 = 212.70/x
  3. Step 3: Cross multiply
    386.24x = 578.83 × 212.70
  4. Step 4: Simplify right side
    386.24x = 123,117.55
  5. Step 5: Solve for x
    x = 123,117.55/386.24
  6. Step 6: Final answer
    x = 318.76

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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.