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Finding the Fourth Proportional to 278.77, 384.81 and 185.61

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Solution

The fourth proportional to 278.77, 384.81 and 185.61 is: 256.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.77 : 384.81 = 185.61 : x
  2. Step 2: Convert to fraction form
    278.77/384.81 = 185.61/x
  3. Step 3: Cross multiply
    278.77x = 384.81 × 185.61
  4. Step 4: Simplify right side
    278.77x = 71,424.58
  5. Step 5: Solve for x
    x = 71,424.58/278.77
  6. Step 6: Final answer
    x = 256.21

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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.