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Finding the Fourth Proportional to 278.36, 384.03 and 161.90

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Solution

The fourth proportional to 278.36, 384.03 and 161.90 is: 223.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.36 : 384.03 = 161.90 : x
  2. Step 2: Convert to fraction form
    278.36/384.03 = 161.90/x
  3. Step 3: Cross multiply
    278.36x = 384.03 × 161.90
  4. Step 4: Simplify right side
    278.36x = 62,174.46
  5. Step 5: Solve for x
    x = 62,174.46/278.36
  6. Step 6: Final answer
    x = 223.36

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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.