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Finding the Fourth Proportional to 402.85, 604.79 and 386.39

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Solution

The fourth proportional to 402.85, 604.79 and 386.39 is: 580.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.85 : 604.79 = 386.39 : x
  2. Step 2: Convert to fraction form
    402.85/604.79 = 386.39/x
  3. Step 3: Cross multiply
    402.85x = 604.79 × 386.39
  4. Step 4: Simplify right side
    402.85x = 233,682.88
  5. Step 5: Solve for x
    x = 233,682.88/402.85
  6. Step 6: Final answer
    x = 580.08

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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.