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Finding the Fourth Proportional to 752.00, 1,040.38 and 620.78

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Solution

The fourth proportional to 752.00, 1,040.38 and 620.78 is: 858.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    752.00 : 1,040.38 = 620.78 : x
  2. Step 2: Convert to fraction form
    752.00/1,040.38 = 620.78/x
  3. Step 3: Cross multiply
    752.00x = 1,040.38 × 620.78
  4. Step 4: Simplify right side
    752.00x = 645,840.34
  5. Step 5: Solve for x
    x = 645,840.34/752.00
  6. Step 6: Final answer
    x = 858.84

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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.