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Finding the Fourth Proportional to 386.24, 578.70 and 308.79

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Solution

The fourth proportional to 386.24, 578.70 and 308.79 is: 462.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.24 : 578.70 = 308.79 : x
  2. Step 2: Convert to fraction form
    386.24/578.70 = 308.79/x
  3. Step 3: Cross multiply
    386.24x = 578.70 × 308.79
  4. Step 4: Simplify right side
    386.24x = 178,696.77
  5. Step 5: Solve for x
    x = 178,696.77/386.24
  6. Step 6: Final answer
    x = 462.66

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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.