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Finding the Fourth Proportional to 420.73, 580.64 and 243.74

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Solution

The fourth proportional to 420.73, 580.64 and 243.74 is: 336.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.73 : 580.64 = 243.74 : x
  2. Step 2: Convert to fraction form
    420.73/580.64 = 243.74/x
  3. Step 3: Cross multiply
    420.73x = 580.64 × 243.74
  4. Step 4: Simplify right side
    420.73x = 141,525.43
  5. Step 5: Solve for x
    x = 141,525.43/420.73
  6. Step 6: Final answer
    x = 336.38

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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.