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Finding the Fourth Proportional to 278.64, 418.05 and 141.81

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Solution

The fourth proportional to 278.64, 418.05 and 141.81 is: 212.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.64 : 418.05 = 141.81 : x
  2. Step 2: Convert to fraction form
    278.64/418.05 = 141.81/x
  3. Step 3: Cross multiply
    278.64x = 418.05 × 141.81
  4. Step 4: Simplify right side
    278.64x = 59,283.67
  5. Step 5: Solve for x
    x = 59,283.67/278.64
  6. Step 6: Final answer
    x = 212.76

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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.