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Finding the Fourth Proportional to 438.09, 605.07 and 290.46

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Solution

The fourth proportional to 438.09, 605.07 and 290.46 is: 401.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.09 : 605.07 = 290.46 : x
  2. Step 2: Convert to fraction form
    438.09/605.07 = 290.46/x
  3. Step 3: Cross multiply
    438.09x = 605.07 × 290.46
  4. Step 4: Simplify right side
    438.09x = 175,750.90
  5. Step 5: Solve for x
    x = 175,750.90/438.09
  6. Step 6: Final answer
    x = 401.18

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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.