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Finding the Fourth Proportional to 620.85, 856.89 and 411.04

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Solution

The fourth proportional to 620.85, 856.89 and 411.04 is: 567.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.85 : 856.89 = 411.04 : x
  2. Step 2: Convert to fraction form
    620.85/856.89 = 411.04/x
  3. Step 3: Cross multiply
    620.85x = 856.89 × 411.04
  4. Step 4: Simplify right side
    620.85x = 352,216.07
  5. Step 5: Solve for x
    x = 352,216.07/620.85
  6. Step 6: Final answer
    x = 567.31

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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.