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Finding the Fourth Proportional to 449.15, 619.90 and 421.36

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Solution

The fourth proportional to 449.15, 619.90 and 421.36 is: 581.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    449.15 : 619.90 = 421.36 : x
  2. Step 2: Convert to fraction form
    449.15/619.90 = 421.36/x
  3. Step 3: Cross multiply
    449.15x = 619.90 × 421.36
  4. Step 4: Simplify right side
    449.15x = 261,198.46
  5. Step 5: Solve for x
    x = 261,198.46/449.15
  6. Step 6: Final answer
    x = 581.54

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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.