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Finding the Fourth Proportional to 829.14, 1,243.42 and 390.25

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Solution

The fourth proportional to 829.14, 1,243.42 and 390.25 is: 585.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    829.14 : 1,243.42 = 390.25 : x
  2. Step 2: Convert to fraction form
    829.14/1,243.42 = 390.25/x
  3. Step 3: Cross multiply
    829.14x = 1,243.42 × 390.25
  4. Step 4: Simplify right side
    829.14x = 485,244.66
  5. Step 5: Solve for x
    x = 485,244.66/829.14
  6. Step 6: Final answer
    x = 585.24

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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.