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Finding the Fourth Proportional to 309.99, 427.67 and 199.53

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Solution

The fourth proportional to 309.99, 427.67 and 199.53 is: 275.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.99 : 427.67 = 199.53 : x
  2. Step 2: Convert to fraction form
    309.99/427.67 = 199.53/x
  3. Step 3: Cross multiply
    309.99x = 427.67 × 199.53
  4. Step 4: Simplify right side
    309.99x = 85,333.00
  5. Step 5: Solve for x
    x = 85,333.00/309.99
  6. Step 6: Final answer
    x = 275.28

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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.