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Finding the Fourth Proportional to 309.80, 427.68 and 204.98

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Solution

The fourth proportional to 309.80, 427.68 and 204.98 is: 282.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.80 : 427.68 = 204.98 : x
  2. Step 2: Convert to fraction form
    309.80/427.68 = 204.98/x
  3. Step 3: Cross multiply
    309.80x = 427.68 × 204.98
  4. Step 4: Simplify right side
    309.80x = 87,663.71
  5. Step 5: Solve for x
    x = 87,663.71/309.80
  6. Step 6: Final answer
    x = 282.97

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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.