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Finding the Fourth Proportional to 643.28, 957.22 and 641.12

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Solution

The fourth proportional to 643.28, 957.22 and 641.12 is: 954.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.28 : 957.22 = 641.12 : x
  2. Step 2: Convert to fraction form
    643.28/957.22 = 641.12/x
  3. Step 3: Cross multiply
    643.28x = 957.22 × 641.12
  4. Step 4: Simplify right side
    643.28x = 613,692.89
  5. Step 5: Solve for x
    x = 613,692.89/643.28
  6. Step 6: Final answer
    x = 954.01

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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.