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Finding the Fourth Proportional to 620.20, 856.14 and 445.24

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Solution

The fourth proportional to 620.20, 856.14 and 445.24 is: 614.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.20 : 856.14 = 445.24 : x
  2. Step 2: Convert to fraction form
    620.20/856.14 = 445.24/x
  3. Step 3: Cross multiply
    620.20x = 856.14 × 445.24
  4. Step 4: Simplify right side
    620.20x = 381,187.77
  5. Step 5: Solve for x
    x = 381,187.77/620.20
  6. Step 6: Final answer
    x = 614.62

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Similar ratio
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1.5x scale

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.