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Finding the Fourth Proportional to 136,999.40, 205,844.70 and 87,103.40

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Solution

The fourth proportional to 136,999.40, 205,844.70 and 87,103.40 is: 130,874.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,999.40 : 205,844.70 = 87,103.40 : x
  2. Step 2: Convert to fraction form
    136,999.40/205,844.70 = 87,103.40/x
  3. Step 3: Cross multiply
    136,999.40x = 205,844.70 × 87,103.40
  4. Step 4: Simplify right side
    136,999.40x = 17,929,773,241.98
  5. Step 5: Solve for x
    x = 17,929,773,241.98/136,999.40
  6. Step 6: Final answer
    x = 130,874.83

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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.