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Finding the Fourth Proportional to 390.66, 539.36 and 250.83

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Solution

The fourth proportional to 390.66, 539.36 and 250.83 is: 346.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.66 : 539.36 = 250.83 : x
  2. Step 2: Convert to fraction form
    390.66/539.36 = 250.83/x
  3. Step 3: Cross multiply
    390.66x = 539.36 × 250.83
  4. Step 4: Simplify right side
    390.66x = 135,287.67
  5. Step 5: Solve for x
    x = 135,287.67/390.66
  6. Step 6: Final answer
    x = 346.31

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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.