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Finding the Fourth Proportional to 202.03, 278.73 and 128.23

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Solution

The fourth proportional to 202.03, 278.73 and 128.23 is: 176.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    202.03 : 278.73 = 128.23 : x
  2. Step 2: Convert to fraction form
    202.03/278.73 = 128.23/x
  3. Step 3: Cross multiply
    202.03x = 278.73 × 128.23
  4. Step 4: Simplify right side
    202.03x = 35,741.55
  5. Step 5: Solve for x
    x = 35,741.55/202.03
  6. Step 6: Final answer
    x = 176.91

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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.