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Finding the Fourth Proportional to 620.44, 856.26 and 354.98

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Solution

The fourth proportional to 620.44, 856.26 and 354.98 is: 489.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.44 : 856.26 = 354.98 : x
  2. Step 2: Convert to fraction form
    620.44/856.26 = 354.98/x
  3. Step 3: Cross multiply
    620.44x = 856.26 × 354.98
  4. Step 4: Simplify right side
    620.44x = 303,955.17
  5. Step 5: Solve for x
    x = 303,955.17/620.44
  6. Step 6: Final answer
    x = 489.90

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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.