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Finding the Fourth Proportional to 807.05, 1,114.28 and 620.21

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Solution

The fourth proportional to 807.05, 1,114.28 and 620.21 is: 856.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    807.05 : 1,114.28 = 620.21 : x
  2. Step 2: Convert to fraction form
    807.05/1,114.28 = 620.21/x
  3. Step 3: Cross multiply
    807.05x = 1,114.28 × 620.21
  4. Step 4: Simplify right side
    807.05x = 691,078.93
  5. Step 5: Solve for x
    x = 691,078.93/807.05
  6. Step 6: Final answer
    x = 856.31

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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.