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Finding the Fourth Proportional to 278.48, 384.66 and 212.84

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Solution

The fourth proportional to 278.48, 384.66 and 212.84 is: 293.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.48 : 384.66 = 212.84 : x
  2. Step 2: Convert to fraction form
    278.48/384.66 = 212.84/x
  3. Step 3: Cross multiply
    278.48x = 384.66 × 212.84
  4. Step 4: Simplify right side
    278.48x = 81,871.03
  5. Step 5: Solve for x
    x = 81,871.03/278.48
  6. Step 6: Final answer
    x = 293.99

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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.