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Finding the Fourth Proportional to 299,488.26, 449,339.31 and 128,638.20

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Solution

The fourth proportional to 299,488.26, 449,339.31 and 128,638.20 is: 193,003.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    299,488.26 : 449,339.31 = 128,638.20 : x
  2. Step 2: Convert to fraction form
    299,488.26/449,339.31 = 128,638.20/x
  3. Step 3: Cross multiply
    299,488.26x = 449,339.31 × 128,638.20
  4. Step 4: Simplify right side
    299,488.26x = 57,802,200,027.64
  5. Step 5: Solve for x
    x = 57,802,200,027.64/299,488.26
  6. Step 6: Final answer
    x = 193,003.22

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1.5x scale

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.