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Finding the Fourth Proportional to 669.88, 924.48 and 449.20

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Solution

The fourth proportional to 669.88, 924.48 and 449.20 is: 619.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.88 : 924.48 = 449.20 : x
  2. Step 2: Convert to fraction form
    669.88/924.48 = 449.20/x
  3. Step 3: Cross multiply
    669.88x = 924.48 × 449.20
  4. Step 4: Simplify right side
    669.88x = 415,269.55
  5. Step 5: Solve for x
    x = 415,269.55/669.88
  6. Step 6: Final answer
    x = 619.92

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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.