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Finding the Fourth Proportional to 301.90, 416.38 and 255.40

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Solution

The fourth proportional to 301.90, 416.38 and 255.40 is: 352.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    301.90 : 416.38 = 255.40 : x
  2. Step 2: Convert to fraction form
    301.90/416.38 = 255.40/x
  3. Step 3: Cross multiply
    301.90x = 416.38 × 255.40
  4. Step 4: Simplify right side
    301.90x = 106,343.45
  5. Step 5: Solve for x
    x = 106,343.45/301.90
  6. Step 6: Final answer
    x = 352.25

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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.