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Finding the Fourth Proportional to 449.26, 619.90 and 291.92

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Solution

The fourth proportional to 449.26, 619.90 and 291.92 is: 402.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    449.26 : 619.90 = 291.92 : x
  2. Step 2: Convert to fraction form
    449.26/619.90 = 291.92/x
  3. Step 3: Cross multiply
    449.26x = 619.90 × 291.92
  4. Step 4: Simplify right side
    449.26x = 180,961.21
  5. Step 5: Solve for x
    x = 180,961.21/449.26
  6. Step 6: Final answer
    x = 402.80

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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.