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Finding the Fourth Proportional to 620.96, 856.54 and 385.02

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Solution

The fourth proportional to 620.96, 856.54 and 385.02 is: 531.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.96 : 856.54 = 385.02 : x
  2. Step 2: Convert to fraction form
    620.96/856.54 = 385.02/x
  3. Step 3: Cross multiply
    620.96x = 856.54 × 385.02
  4. Step 4: Simplify right side
    620.96x = 329,785.03
  5. Step 5: Solve for x
    x = 329,785.03/620.96
  6. Step 6: Final answer
    x = 531.09

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.