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Finding the Fourth Proportional to 278.72, 384.48 and 162.20

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Solution

The fourth proportional to 278.72, 384.48 and 162.20 is: 223.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.72 : 384.48 = 162.20 : x
  2. Step 2: Convert to fraction form
    278.72/384.48 = 162.20/x
  3. Step 3: Cross multiply
    278.72x = 384.48 × 162.20
  4. Step 4: Simplify right side
    278.72x = 62,362.66
  5. Step 5: Solve for x
    x = 62,362.66/278.72
  6. Step 6: Final answer
    x = 223.75

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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.