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Finding the Fourth Proportional to 829.87, 1,243.25 and 418.01

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Solution

The fourth proportional to 829.87, 1,243.25 and 418.01 is: 626.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    829.87 : 1,243.25 = 418.01 : x
  2. Step 2: Convert to fraction form
    829.87/1,243.25 = 418.01/x
  3. Step 3: Cross multiply
    829.87x = 1,243.25 × 418.01
  4. Step 4: Simplify right side
    829.87x = 519,682.63
  5. Step 5: Solve for x
    x = 519,682.63/829.87
  6. Step 6: Final answer
    x = 626.22

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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.