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Finding the Fourth Proportional to 299.72, 449.58 and 117.20

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Solution

The fourth proportional to 299.72, 449.58 and 117.20 is: 175.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    299.72 : 449.58 = 117.20 : x
  2. Step 2: Convert to fraction form
    299.72/449.58 = 117.20/x
  3. Step 3: Cross multiply
    299.72x = 449.58 × 117.20
  4. Step 4: Simplify right side
    299.72x = 52,690.78
  5. Step 5: Solve for x
    x = 52,690.78/299.72
  6. Step 6: Final answer
    x = 175.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.