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Finding the Fourth Proportional to 390.03, 537.92 and 351.63

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Solution

The fourth proportional to 390.03, 537.92 and 351.63 is: 484.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.03 : 537.92 = 351.63 : x
  2. Step 2: Convert to fraction form
    390.03/537.92 = 351.63/x
  3. Step 3: Cross multiply
    390.03x = 537.92 × 351.63
  4. Step 4: Simplify right side
    390.03x = 189,147.05
  5. Step 5: Solve for x
    x = 189,147.05/390.03
  6. Step 6: Final answer
    x = 484.96

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.