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Finding the Fourth Proportional to 620.85, 856.80 and 341.09

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Solution

The fourth proportional to 620.85, 856.80 and 341.09 is: 470.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.85 : 856.80 = 341.09 : x
  2. Step 2: Convert to fraction form
    620.85/856.80 = 341.09/x
  3. Step 3: Cross multiply
    620.85x = 856.80 × 341.09
  4. Step 4: Simplify right side
    620.85x = 292,248.46
  5. Step 5: Solve for x
    x = 292,248.46/620.85
  6. Step 6: Final answer
    x = 470.72

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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.