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Finding the Fourth Proportional to 278.35, 417.81 and 190.51

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Solution

The fourth proportional to 278.35, 417.81 and 190.51 is: 285.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.35 : 417.81 = 190.51 : x
  2. Step 2: Convert to fraction form
    278.35/417.81 = 190.51/x
  3. Step 3: Cross multiply
    278.35x = 417.81 × 190.51
  4. Step 4: Simplify right side
    278.35x = 79,596.98
  5. Step 5: Solve for x
    x = 79,596.98/278.35
  6. Step 6: Final answer
    x = 285.96

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.