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Finding the Fourth Proportional to 620.79, 856.70 and 341.05

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Solution

The fourth proportional to 620.79, 856.70 and 341.05 is: 470.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.79 : 856.70 = 341.05 : x
  2. Step 2: Convert to fraction form
    620.79/856.70 = 341.05/x
  3. Step 3: Cross multiply
    620.79x = 856.70 × 341.05
  4. Step 4: Simplify right side
    620.79x = 292,178.82
  5. Step 5: Solve for x
    x = 292,178.82/620.79
  6. Step 6: Final answer
    x = 470.66

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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.