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Finding the Fourth Proportional to 829.19, 1,243.81 and 309.32

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Solution

The fourth proportional to 829.19, 1,243.81 and 309.32 is: 463.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    829.19 : 1,243.81 = 309.32 : x
  2. Step 2: Convert to fraction form
    829.19/1,243.81 = 309.32/x
  3. Step 3: Cross multiply
    829.19x = 1,243.81 × 309.32
  4. Step 4: Simplify right side
    829.19x = 384,736.08
  5. Step 5: Solve for x
    x = 384,736.08/829.19
  6. Step 6: Final answer
    x = 463.99

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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.