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Finding the Fourth Proportional to 620.77, 856.60 and 372.09

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Solution

The fourth proportional to 620.77, 856.60 and 372.09 is: 513.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.77 : 856.60 = 372.09 : x
  2. Step 2: Convert to fraction form
    620.77/856.60 = 372.09/x
  3. Step 3: Cross multiply
    620.77x = 856.60 × 372.09
  4. Step 4: Simplify right side
    620.77x = 318,728.01
  5. Step 5: Solve for x
    x = 318,728.01/620.77
  6. Step 6: Final answer
    x = 513.44

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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.