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Finding the Fourth Proportional to 857.23, 1,283.68 and 423.25

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Solution

The fourth proportional to 857.23, 1,283.68 and 423.25 is: 633.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    857.23 : 1,283.68 = 423.25 : x
  2. Step 2: Convert to fraction form
    857.23/1,283.68 = 423.25/x
  3. Step 3: Cross multiply
    857.23x = 1,283.68 × 423.25
  4. Step 4: Simplify right side
    857.23x = 543,317.56
  5. Step 5: Solve for x
    x = 543,317.56/857.23
  6. Step 6: Final answer
    x = 633.81

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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.