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Finding the Fourth Proportional to 1,021.50, 1,403.55 and 834.48

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Solution

The fourth proportional to 1,021.50, 1,403.55 and 834.48 is: 1,146.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,021.50 : 1,403.55 = 834.48 : x
  2. Step 2: Convert to fraction form
    1,021.50/1,403.55 = 834.48/x
  3. Step 3: Cross multiply
    1,021.50x = 1,403.55 × 834.48
  4. Step 4: Simplify right side
    1,021.50x = 1,171,234.40
  5. Step 5: Solve for x
    x = 1,171,234.40/1,021.50
  6. Step 6: Final answer
    x = 1,146.58

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.