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Finding the Fourth Proportional to 201.74, 278.46 and 128.02

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Solution

The fourth proportional to 201.74, 278.46 and 128.02 is: 176.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    201.74 : 278.46 = 128.02 : x
  2. Step 2: Convert to fraction form
    201.74/278.46 = 128.02/x
  3. Step 3: Cross multiply
    201.74x = 278.46 × 128.02
  4. Step 4: Simplify right side
    201.74x = 35,648.45
  5. Step 5: Solve for x
    x = 35,648.45/201.74
  6. Step 6: Final answer
    x = 176.70

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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.