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Finding the Fourth Proportional to 386.72, 578.96 and 308.96

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Solution

The fourth proportional to 386.72, 578.96 and 308.96 is: 462.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.72 : 578.96 = 308.96 : x
  2. Step 2: Convert to fraction form
    386.72/578.96 = 308.96/x
  3. Step 3: Cross multiply
    386.72x = 578.96 × 308.96
  4. Step 4: Simplify right side
    386.72x = 178,875.48
  5. Step 5: Solve for x
    x = 178,875.48/386.72
  6. Step 6: Final answer
    x = 462.55

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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.