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Finding the Fourth Proportional to 210.56, 315.72 and 82.28

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Solution

The fourth proportional to 210.56, 315.72 and 82.28 is: 123.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.56 : 315.72 = 82.28 : x
  2. Step 2: Convert to fraction form
    210.56/315.72 = 82.28/x
  3. Step 3: Cross multiply
    210.56x = 315.72 × 82.28
  4. Step 4: Simplify right side
    210.56x = 25,977.44
  5. Step 5: Solve for x
    x = 25,977.44/210.56
  6. Step 6: Final answer
    x = 123.37

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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.