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Finding the Fourth Proportional to 309.86, 427.34 and 276.26

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Solution

The fourth proportional to 309.86, 427.34 and 276.26 is: 381.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.86 : 427.34 = 276.26 : x
  2. Step 2: Convert to fraction form
    309.86/427.34 = 276.26/x
  3. Step 3: Cross multiply
    309.86x = 427.34 × 276.26
  4. Step 4: Simplify right side
    309.86x = 118,056.95
  5. Step 5: Solve for x
    x = 118,056.95/309.86
  6. Step 6: Final answer
    x = 381.00

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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.