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Finding the Fourth Proportional to 716.05, 986.21 and 622.09

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Solution

The fourth proportional to 716.05, 986.21 and 622.09 is: 856.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    716.05 : 986.21 = 622.09 : x
  2. Step 2: Convert to fraction form
    716.05/986.21 = 622.09/x
  3. Step 3: Cross multiply
    716.05x = 986.21 × 622.09
  4. Step 4: Simplify right side
    716.05x = 613,508.27
  5. Step 5: Solve for x
    x = 613,508.27/716.05
  6. Step 6: Final answer
    x = 856.80

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1.5x scale

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.