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Finding the Fourth Proportional to 390.97, 539.44 and 233.53

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Solution

The fourth proportional to 390.97, 539.44 and 233.53 is: 322.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.97 : 539.44 = 233.53 : x
  2. Step 2: Convert to fraction form
    390.97/539.44 = 233.53/x
  3. Step 3: Cross multiply
    390.97x = 539.44 × 233.53
  4. Step 4: Simplify right side
    390.97x = 125,976.96
  5. Step 5: Solve for x
    x = 125,976.96/390.97
  6. Step 6: Final answer
    x = 322.21

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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.