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Finding the Fourth Proportional to 641.60, 957.44 and 620.56

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Solution

The fourth proportional to 641.60, 957.44 and 620.56 is: 926.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.60 : 957.44 = 620.56 : x
  2. Step 2: Convert to fraction form
    641.60/957.44 = 620.56/x
  3. Step 3: Cross multiply
    641.60x = 957.44 × 620.56
  4. Step 4: Simplify right side
    641.60x = 594,148.97
  5. Step 5: Solve for x
    x = 594,148.97/641.60
  6. Step 6: Final answer
    x = 926.04

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.