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Finding the Fourth Proportional to 1,077.79, 1,485.69 and 745.65

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Solution

The fourth proportional to 1,077.79, 1,485.69 and 745.65 is: 1,027.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,077.79 : 1,485.69 = 745.65 : x
  2. Step 2: Convert to fraction form
    1,077.79/1,485.69 = 745.65/x
  3. Step 3: Cross multiply
    1,077.79x = 1,485.69 × 745.65
  4. Step 4: Simplify right side
    1,077.79x = 1,107,804.75
  5. Step 5: Solve for x
    x = 1,107,804.75/1,077.79
  6. Step 6: Final answer
    x = 1,027.85

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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.