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Finding the Fourth Proportional to 278.99, 418.53 and 105.71

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Solution

The fourth proportional to 278.99, 418.53 and 105.71 is: 158.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.99 : 418.53 = 105.71 : x
  2. Step 2: Convert to fraction form
    278.99/418.53 = 105.71/x
  3. Step 3: Cross multiply
    278.99x = 418.53 × 105.71
  4. Step 4: Simplify right side
    278.99x = 44,240.71
  5. Step 5: Solve for x
    x = 44,240.71/278.99
  6. Step 6: Final answer
    x = 158.58

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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.