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Finding the Fourth Proportional to 309.86, 427.59 and 177.08

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Solution

The fourth proportional to 309.86, 427.59 and 177.08 is: 244.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.86 : 427.59 = 177.08 : x
  2. Step 2: Convert to fraction form
    309.86/427.59 = 177.08/x
  3. Step 3: Cross multiply
    309.86x = 427.59 × 177.08
  4. Step 4: Simplify right side
    309.86x = 75,717.64
  5. Step 5: Solve for x
    x = 75,717.64/309.86
  6. Step 6: Final answer
    x = 244.36

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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.