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Finding the Fourth Proportional to 215.37, 297.05 and 128.03

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Solution

The fourth proportional to 215.37, 297.05 and 128.03 is: 176.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.37 : 297.05 = 128.03 : x
  2. Step 2: Convert to fraction form
    215.37/297.05 = 128.03/x
  3. Step 3: Cross multiply
    215.37x = 297.05 × 128.03
  4. Step 4: Simplify right side
    215.37x = 38,029.19
  5. Step 5: Solve for x
    x = 38,029.19/215.37
  6. Step 6: Final answer
    x = 176.58

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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.