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Finding the Fourth Proportional to 1,040.54, 1,435.28 and 620.60

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Solution

The fourth proportional to 1,040.54, 1,435.28 and 620.60 is: 856.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,040.54 : 1,435.28 = 620.60 : x
  2. Step 2: Convert to fraction form
    1,040.54/1,435.28 = 620.60/x
  3. Step 3: Cross multiply
    1,040.54x = 1,435.28 × 620.60
  4. Step 4: Simplify right side
    1,040.54x = 890,724.49
  5. Step 5: Solve for x
    x = 890,724.49/1,040.54
  6. Step 6: Final answer
    x = 856.03

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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.