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Finding the Fourth Proportional to 201,990.88, 278,714.82 and 121,399.12

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Solution

The fourth proportional to 201,990.88, 278,714.82 and 121,399.12 is: 167,511.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    201,990.88 : 278,714.82 = 121,399.12 : x
  2. Step 2: Convert to fraction form
    201,990.88/278,714.82 = 121,399.12/x
  3. Step 3: Cross multiply
    201,990.88x = 278,714.82 × 121,399.12
  4. Step 4: Simplify right side
    201,990.88x = 33,835,733,878.96
  5. Step 5: Solve for x
    x = 33,835,733,878.96/201,990.88
  6. Step 6: Final answer
    x = 167,511.20

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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.