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Finding the Fourth Proportional to 299.55, 448.79 and 261.15

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Solution

The fourth proportional to 299.55, 448.79 and 261.15 is: 391.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    299.55 : 448.79 = 261.15 : x
  2. Step 2: Convert to fraction form
    299.55/448.79 = 261.15/x
  3. Step 3: Cross multiply
    299.55x = 448.79 × 261.15
  4. Step 4: Simplify right side
    299.55x = 117,200.20
  5. Step 5: Solve for x
    x = 117,200.20/299.55
  6. Step 6: Final answer
    x = 391.25

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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.