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Finding the Fourth Proportional to 1,040.64, 1,435.56 and 620.70

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Solution

The fourth proportional to 1,040.64, 1,435.56 and 620.70 is: 856.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,040.64 : 1,435.56 = 620.70 : x
  2. Step 2: Convert to fraction form
    1,040.64/1,435.56 = 620.70/x
  3. Step 3: Cross multiply
    1,040.64x = 1,435.56 × 620.70
  4. Step 4: Simplify right side
    1,040.64x = 891,052.09
  5. Step 5: Solve for x
    x = 891,052.09/1,040.64
  6. Step 6: Final answer
    x = 856.25

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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.