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Finding the Fourth Proportional to 278.21, 383.94 and 153.87

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Solution

The fourth proportional to 278.21, 383.94 and 153.87 is: 212.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.21 : 383.94 = 153.87 : x
  2. Step 2: Convert to fraction form
    278.21/383.94 = 153.87/x
  3. Step 3: Cross multiply
    278.21x = 383.94 × 153.87
  4. Step 4: Simplify right side
    278.21x = 59,076.85
  5. Step 5: Solve for x
    x = 59,076.85/278.21
  6. Step 6: Final answer
    x = 212.35

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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.