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Finding the Fourth Proportional to 1,075.78, 1,485.03 and 682.93

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Solution

The fourth proportional to 1,075.78, 1,485.03 and 682.93 is: 942.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,075.78 : 1,485.03 = 682.93 : x
  2. Step 2: Convert to fraction form
    1,075.78/1,485.03 = 682.93/x
  3. Step 3: Cross multiply
    1,075.78x = 1,485.03 × 682.93
  4. Step 4: Simplify right side
    1,075.78x = 1,014,171.54
  5. Step 5: Solve for x
    x = 1,014,171.54/1,075.78
  6. Step 6: Final answer
    x = 942.73

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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.