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Finding the Fourth Proportional to 755, 1,129.80 and 447.02

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Solution

The fourth proportional to 755, 1,129.80 and 447.02 is: 668.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    755 : 1,129.80 = 447.02 : x
  2. Step 2: Convert to fraction form
    755/1,129.80 = 447.02/x
  3. Step 3: Cross multiply
    755x = 1,129.80 × 447.02
  4. Step 4: Simplify right side
    755x = 505,043.20
  5. Step 5: Solve for x
    x = 505,043.20/755
  6. Step 6: Final answer
    x = 668.93

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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.