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Finding the Fourth Proportional to 305.55, 421.69 and 200.72

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Solution

The fourth proportional to 305.55, 421.69 and 200.72 is: 277.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    305.55 : 421.69 = 200.72 : x
  2. Step 2: Convert to fraction form
    305.55/421.69 = 200.72/x
  3. Step 3: Cross multiply
    305.55x = 421.69 × 200.72
  4. Step 4: Simplify right side
    305.55x = 84,641.62
  5. Step 5: Solve for x
    x = 84,641.62/305.55
  6. Step 6: Final answer
    x = 277.01

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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.