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Finding the Fourth Proportional to 572.75, 857.30 and 485.27

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Solution

The fourth proportional to 572.75, 857.30 and 485.27 is: 726.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    572.75 : 857.30 = 485.27 : x
  2. Step 2: Convert to fraction form
    572.75/857.30 = 485.27/x
  3. Step 3: Cross multiply
    572.75x = 857.30 × 485.27
  4. Step 4: Simplify right side
    572.75x = 416,015.26
  5. Step 5: Solve for x
    x = 416,015.26/572.75
  6. Step 6: Final answer
    x = 726.35

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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.