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Finding the Fourth Proportional to 1,379.24, 2,065.40 and 728.54

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Solution

The fourth proportional to 1,379.24, 2,065.40 and 728.54 is: 1,090.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,379.24 : 2,065.40 = 728.54 : x
  2. Step 2: Convert to fraction form
    1,379.24/2,065.40 = 728.54/x
  3. Step 3: Cross multiply
    1,379.24x = 2,065.40 × 728.54
  4. Step 4: Simplify right side
    1,379.24x = 1,504,726.52
  5. Step 5: Solve for x
    x = 1,504,726.52/1,379.24
  6. Step 6: Final answer
    x = 1,090.98

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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.