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Finding the Fourth Proportional to 309.91, 427.58 and 177.13

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Solution

The fourth proportional to 309.91, 427.58 and 177.13 is: 244.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.91 : 427.58 = 177.13 : x
  2. Step 2: Convert to fraction form
    309.91/427.58 = 177.13/x
  3. Step 3: Cross multiply
    309.91x = 427.58 × 177.13
  4. Step 4: Simplify right side
    309.91x = 75,735.55
  5. Step 5: Solve for x
    x = 75,735.55/309.91
  6. Step 6: Final answer
    x = 244.38

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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.