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Finding the Fourth Proportional to 639.57, 957.46 and 572.75

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Solution

The fourth proportional to 639.57, 957.46 and 572.75 is: 857.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.57 : 957.46 = 572.75 : x
  2. Step 2: Convert to fraction form
    639.57/957.46 = 572.75/x
  3. Step 3: Cross multiply
    639.57x = 957.46 × 572.75
  4. Step 4: Simplify right side
    639.57x = 548,385.22
  5. Step 5: Solve for x
    x = 548,385.22/639.57
  6. Step 6: Final answer
    x = 857.43

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.