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Finding the Fourth Proportional to 829.51, 1,243.81 and 342.29

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Solution

The fourth proportional to 829.51, 1,243.81 and 342.29 is: 513.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    829.51 : 1,243.81 = 342.29 : x
  2. Step 2: Convert to fraction form
    829.51/1,243.81 = 342.29/x
  3. Step 3: Cross multiply
    829.51x = 1,243.81 × 342.29
  4. Step 4: Simplify right side
    829.51x = 425,745.34
  5. Step 5: Solve for x
    x = 425,745.34/829.51
  6. Step 6: Final answer
    x = 513.25

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.