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Finding the Fourth Proportional to 215.54, 297.47 and 128.23

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Solution

The fourth proportional to 215.54, 297.47 and 128.23 is: 176.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.54 : 297.47 = 128.23 : x
  2. Step 2: Convert to fraction form
    215.54/297.47 = 128.23/x
  3. Step 3: Cross multiply
    215.54x = 297.47 × 128.23
  4. Step 4: Simplify right side
    215.54x = 38,142.45
  5. Step 5: Solve for x
    x = 38,142.45/215.54
  6. Step 6: Final answer
    x = 176.96

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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.