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Finding the Fourth Proportional to 449.20, 619.62 and 291.68

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Solution

The fourth proportional to 449.20, 619.62 and 291.68 is: 402.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    449.20 : 619.62 = 291.68 : x
  2. Step 2: Convert to fraction form
    449.20/619.62 = 291.68/x
  3. Step 3: Cross multiply
    449.20x = 619.62 × 291.68
  4. Step 4: Simplify right side
    449.20x = 180,730.76
  5. Step 5: Solve for x
    x = 180,730.76/449.20
  6. Step 6: Final answer
    x = 402.34

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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.