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Finding the Fourth Proportional to 386.51, 580.21 and 305.39

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Solution

The fourth proportional to 386.51, 580.21 and 305.39 is: 458.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.51 : 580.21 = 305.39 : x
  2. Step 2: Convert to fraction form
    386.51/580.21 = 305.39/x
  3. Step 3: Cross multiply
    386.51x = 580.21 × 305.39
  4. Step 4: Simplify right side
    386.51x = 177,191.02
  5. Step 5: Solve for x
    x = 177,191.02/386.51
  6. Step 6: Final answer
    x = 458.44

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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.