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Finding the Fourth Proportional to 278.76, 385.13 and 235.83

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Solution

The fourth proportional to 278.76, 385.13 and 235.83 is: 325.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.76 : 385.13 = 235.83 : x
  2. Step 2: Convert to fraction form
    278.76/385.13 = 235.83/x
  3. Step 3: Cross multiply
    278.76x = 385.13 × 235.83
  4. Step 4: Simplify right side
    278.76x = 90,824.03
  5. Step 5: Solve for x
    x = 90,824.03/278.76
  6. Step 6: Final answer
    x = 325.81

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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.