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Finding the Fourth Proportional to 309.95, 427.74 and 170.07

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Solution

The fourth proportional to 309.95, 427.74 and 170.07 is: 234.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.95 : 427.74 = 170.07 : x
  2. Step 2: Convert to fraction form
    309.95/427.74 = 170.07/x
  3. Step 3: Cross multiply
    309.95x = 427.74 × 170.07
  4. Step 4: Simplify right side
    309.95x = 72,745.74
  5. Step 5: Solve for x
    x = 72,745.74/309.95
  6. Step 6: Final answer
    x = 234.70

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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.