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Finding the Fourth Proportional to 204.72, 305.54 and 156.40

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Solution

The fourth proportional to 204.72, 305.54 and 156.40 is: 233.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    204.72 : 305.54 = 156.40 : x
  2. Step 2: Convert to fraction form
    204.72/305.54 = 156.40/x
  3. Step 3: Cross multiply
    204.72x = 305.54 × 156.40
  4. Step 4: Simplify right side
    204.72x = 47,786.46
  5. Step 5: Solve for x
    x = 47,786.46/204.72
  6. Step 6: Final answer
    x = 233.42

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.