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Finding the Fourth Proportional to 421.17, 580.53 and 273.55

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Solution

The fourth proportional to 421.17, 580.53 and 273.55 is: 377.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.17 : 580.53 = 273.55 : x
  2. Step 2: Convert to fraction form
    421.17/580.53 = 273.55/x
  3. Step 3: Cross multiply
    421.17x = 580.53 × 273.55
  4. Step 4: Simplify right side
    421.17x = 158,803.98
  5. Step 5: Solve for x
    x = 158,803.98/421.17
  6. Step 6: Final answer
    x = 377.05

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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.