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Finding the Fourth Proportional to 205.64, 283.76 and 128.06

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Solution

The fourth proportional to 205.64, 283.76 and 128.06 is: 176.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    205.64 : 283.76 = 128.06 : x
  2. Step 2: Convert to fraction form
    205.64/283.76 = 128.06/x
  3. Step 3: Cross multiply
    205.64x = 283.76 × 128.06
  4. Step 4: Simplify right side
    205.64x = 36,338.31
  5. Step 5: Solve for x
    x = 36,338.31/205.64
  6. Step 6: Final answer
    x = 176.71

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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.