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Finding the Fourth Proportional to 215.55, 297.50 and 128.27

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Solution

The fourth proportional to 215.55, 297.50 and 128.27 is: 177.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.55 : 297.50 = 128.27 : x
  2. Step 2: Convert to fraction form
    215.55/297.50 = 128.27/x
  3. Step 3: Cross multiply
    215.55x = 297.50 × 128.27
  4. Step 4: Simplify right side
    215.55x = 38,160.33
  5. Step 5: Solve for x
    x = 38,160.33/215.55
  6. Step 6: Final answer
    x = 177.04

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.