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Finding the Fourth Proportional to 309.13, 426.60 and 171.13

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Solution

The fourth proportional to 309.13, 426.60 and 171.13 is: 236.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.13 : 426.60 = 171.13 : x
  2. Step 2: Convert to fraction form
    309.13/426.60 = 171.13/x
  3. Step 3: Cross multiply
    309.13x = 426.60 × 171.13
  4. Step 4: Simplify right side
    309.13x = 73,001.93
  5. Step 5: Solve for x
    x = 73,001.93/309.13
  6. Step 6: Final answer
    x = 236.16

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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.