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Finding the Fourth Proportional to 643.79, 957.41 and 623.29

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Solution

The fourth proportional to 643.79, 957.41 and 623.29 is: 926.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.79 : 957.41 = 623.29 : x
  2. Step 2: Convert to fraction form
    643.79/957.41 = 623.29/x
  3. Step 3: Cross multiply
    643.79x = 957.41 × 623.29
  4. Step 4: Simplify right side
    643.79x = 596,738.57
  5. Step 5: Solve for x
    x = 596,738.57/643.79
  6. Step 6: Final answer
    x = 926.91

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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.