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Finding the Fourth Proportional to 1,015.85, 1,523.85 and 285.43

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Solution

The fourth proportional to 1,015.85, 1,523.85 and 285.43 is: 428.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,015.85 : 1,523.85 = 285.43 : x
  2. Step 2: Convert to fraction form
    1,015.85/1,523.85 = 285.43/x
  3. Step 3: Cross multiply
    1,015.85x = 1,523.85 × 285.43
  4. Step 4: Simplify right side
    1,015.85x = 434,948.70
  5. Step 5: Solve for x
    x = 434,948.70/1,015.85
  6. Step 6: Final answer
    x = 428.16

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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.