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Finding the Fourth Proportional to 1,021.75, 1,533.09 and 790.29

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Solution

The fourth proportional to 1,021.75, 1,533.09 and 790.29 is: 1,185.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,021.75 : 1,533.09 = 790.29 : x
  2. Step 2: Convert to fraction form
    1,021.75/1,533.09 = 790.29/x
  3. Step 3: Cross multiply
    1,021.75x = 1,533.09 × 790.29
  4. Step 4: Simplify right side
    1,021.75x = 1,211,588.66
  5. Step 5: Solve for x
    x = 1,211,588.66/1,021.75
  6. Step 6: Final answer
    x = 1,185.80

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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.