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Finding the Fourth Proportional to 206.94, 285.53 and 128.34

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Solution

The fourth proportional to 206.94, 285.53 and 128.34 is: 177.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    206.94 : 285.53 = 128.34 : x
  2. Step 2: Convert to fraction form
    206.94/285.53 = 128.34/x
  3. Step 3: Cross multiply
    206.94x = 285.53 × 128.34
  4. Step 4: Simplify right side
    206.94x = 36,644.28
  5. Step 5: Solve for x
    x = 36,644.28/206.94
  6. Step 6: Final answer
    x = 177.08

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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.