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Finding the Fourth Proportional to 279.99, 420.17 and 188.73

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Solution

The fourth proportional to 279.99, 420.17 and 188.73 is: 283.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.99 : 420.17 = 188.73 : x
  2. Step 2: Convert to fraction form
    279.99/420.17 = 188.73/x
  3. Step 3: Cross multiply
    279.99x = 420.17 × 188.73
  4. Step 4: Simplify right side
    279.99x = 79,297.74
  5. Step 5: Solve for x
    x = 79,297.74/279.99
  6. Step 6: Final answer
    x = 283.22

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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.