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Finding the Fourth Proportional to 278.12, 384.19 and 195.20

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Solution

The fourth proportional to 278.12, 384.19 and 195.20 is: 269.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.12 : 384.19 = 195.20 : x
  2. Step 2: Convert to fraction form
    278.12/384.19 = 195.20/x
  3. Step 3: Cross multiply
    278.12x = 384.19 × 195.20
  4. Step 4: Simplify right side
    278.12x = 74,993.89
  5. Step 5: Solve for x
    x = 74,993.89/278.12
  6. Step 6: Final answer
    x = 269.65

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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.