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Finding the Fourth Proportional to 390.98, 539.36 and 251.05

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Solution

The fourth proportional to 390.98, 539.36 and 251.05 is: 346.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.98 : 539.36 = 251.05 : x
  2. Step 2: Convert to fraction form
    390.98/539.36 = 251.05/x
  3. Step 3: Cross multiply
    390.98x = 539.36 × 251.05
  4. Step 4: Simplify right side
    390.98x = 135,405.68
  5. Step 5: Solve for x
    x = 135,405.68/390.98
  6. Step 6: Final answer
    x = 346.33

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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.