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Finding the Fourth Proportional to 278.84, 418.32 and 256.34

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Solution

The fourth proportional to 278.84, 418.32 and 256.34 is: 384.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.84 : 418.32 = 256.34 : x
  2. Step 2: Convert to fraction form
    278.84/418.32 = 256.34/x
  3. Step 3: Cross multiply
    278.84x = 418.32 × 256.34
  4. Step 4: Simplify right side
    278.84x = 107,230.06
  5. Step 5: Solve for x
    x = 107,230.06/278.84
  6. Step 6: Final answer
    x = 384.56

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.