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Finding the Fourth Proportional to 278.61, 384.49 and 160.54

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Solution

The fourth proportional to 278.61, 384.49 and 160.54 is: 221.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.61 : 384.49 = 160.54 : x
  2. Step 2: Convert to fraction form
    278.61/384.49 = 160.54/x
  3. Step 3: Cross multiply
    278.61x = 384.49 × 160.54
  4. Step 4: Simplify right side
    278.61x = 61,725.26
  5. Step 5: Solve for x
    x = 61,725.26/278.61
  6. Step 6: Final answer
    x = 221.55

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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.