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Finding the Fourth Proportional to 215.96, 298.01 and 128.63

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Solution

The fourth proportional to 215.96, 298.01 and 128.63 is: 177.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.96 : 298.01 = 128.63 : x
  2. Step 2: Convert to fraction form
    215.96/298.01 = 128.63/x
  3. Step 3: Cross multiply
    215.96x = 298.01 × 128.63
  4. Step 4: Simplify right side
    215.96x = 38,330.89
  5. Step 5: Solve for x
    x = 38,330.89/215.96
  6. Step 6: Final answer
    x = 177.49

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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.