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Finding the Fourth Proportional to 278.55, 383.94 and 191.07

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Solution

The fourth proportional to 278.55, 383.94 and 191.07 is: 263.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.55 : 383.94 = 191.07 : x
  2. Step 2: Convert to fraction form
    278.55/383.94 = 191.07/x
  3. Step 3: Cross multiply
    278.55x = 383.94 × 191.07
  4. Step 4: Simplify right side
    278.55x = 73,359.42
  5. Step 5: Solve for x
    x = 73,359.42/278.55
  6. Step 6: Final answer
    x = 263.36

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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.