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Finding the Fourth Proportional to 420.11, 579.77 and 254.30

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Solution

The fourth proportional to 420.11, 579.77 and 254.30 is: 350.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.11 : 579.77 = 254.30 : x
  2. Step 2: Convert to fraction form
    420.11/579.77 = 254.30/x
  3. Step 3: Cross multiply
    420.11x = 579.77 × 254.30
  4. Step 4: Simplify right side
    420.11x = 147,431.34
  5. Step 5: Solve for x
    x = 147,431.34/420.11
  6. Step 6: Final answer
    x = 350.93

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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.