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Finding the Fourth Proportional to 620.27, 856.10 and 358.30

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Solution

The fourth proportional to 620.27, 856.10 and 358.30 is: 494.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.27 : 856.10 = 358.30 : x
  2. Step 2: Convert to fraction form
    620.27/856.10 = 358.30/x
  3. Step 3: Cross multiply
    620.27x = 856.10 × 358.30
  4. Step 4: Simplify right side
    620.27x = 306,736.70
  5. Step 5: Solve for x
    x = 306,736.70/620.27
  6. Step 6: Final answer
    x = 494.53

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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.