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Finding the Fourth Proportional to 1,523.55, 2,285.31 and 428.22

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Solution

The fourth proportional to 1,523.55, 2,285.31 and 428.22 is: 642.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,523.55 : 2,285.31 = 428.22 : x
  2. Step 2: Convert to fraction form
    1,523.55/2,285.31 = 428.22/x
  3. Step 3: Cross multiply
    1,523.55x = 2,285.31 × 428.22
  4. Step 4: Simplify right side
    1,523.55x = 978,615.45
  5. Step 5: Solve for x
    x = 978,615.45/1,523.55
  6. Step 6: Final answer
    x = 642.33

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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.