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Finding the Fourth Proportional to 620.11, 856.34 and 472.69

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Solution

The fourth proportional to 620.11, 856.34 and 472.69 is: 652.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.11 : 856.34 = 472.69 : x
  2. Step 2: Convert to fraction form
    620.11/856.34 = 472.69/x
  3. Step 3: Cross multiply
    620.11x = 856.34 × 472.69
  4. Step 4: Simplify right side
    620.11x = 404,783.35
  5. Step 5: Solve for x
    x = 404,783.35/620.11
  6. Step 6: Final answer
    x = 652.76

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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.