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Finding the Fourth Proportional to 215.52, 297.41 and 128.19

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Solution

The fourth proportional to 215.52, 297.41 and 128.19 is: 176.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.52 : 297.41 = 128.19 : x
  2. Step 2: Convert to fraction form
    215.52/297.41 = 128.19/x
  3. Step 3: Cross multiply
    215.52x = 297.41 × 128.19
  4. Step 4: Simplify right side
    215.52x = 38,124.99
  5. Step 5: Solve for x
    x = 38,124.99/215.52
  6. Step 6: Final answer
    x = 176.90

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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.