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Finding the Fourth Proportional to 301.40, 415.78 and 190.69

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Solution

The fourth proportional to 301.40, 415.78 and 190.69 is: 263.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    301.40 : 415.78 = 190.69 : x
  2. Step 2: Convert to fraction form
    301.40/415.78 = 190.69/x
  3. Step 3: Cross multiply
    301.40x = 415.78 × 190.69
  4. Step 4: Simplify right side
    301.40x = 79,285.09
  5. Step 5: Solve for x
    x = 79,285.09/301.40
  6. Step 6: Final answer
    x = 263.06

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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.