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Finding the Fourth Proportional to 205.44, 307.76 and 128.18

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Solution

The fourth proportional to 205.44, 307.76 and 128.18 is: 192.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    205.44 : 307.76 = 128.18 : x
  2. Step 2: Convert to fraction form
    205.44/307.76 = 128.18/x
  3. Step 3: Cross multiply
    205.44x = 307.76 × 128.18
  4. Step 4: Simplify right side
    205.44x = 39,446.50
  5. Step 5: Solve for x
    x = 39,446.50/205.44
  6. Step 6: Final answer
    x = 192.01

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.