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Finding the Fourth Proportional to 1,174.20, 1,619.69 and 775.72

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Solution

The fourth proportional to 1,174.20, 1,619.69 and 775.72 is: 1,070.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,174.20 : 1,619.69 = 775.72 : x
  2. Step 2: Convert to fraction form
    1,174.20/1,619.69 = 775.72/x
  3. Step 3: Cross multiply
    1,174.20x = 1,619.69 × 775.72
  4. Step 4: Simplify right side
    1,174.20x = 1,256,413.95
  5. Step 5: Solve for x
    x = 1,256,413.95/1,174.20
  6. Step 6: Final answer
    x = 1,070.02

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.