Home / 128,904,778.35-177,892,890.98-72,399,481.89

Finding the Fourth Proportional to 128,904,778.35, 177,892,890.98 and 72,399,481.89

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Solution

The fourth proportional to 128,904,778.35, 177,892,890.98 and 72,399,481.89 is: 99,913,698.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,904,778.35 : 177,892,890.98 = 72,399,481.89 : x
  2. Step 2: Convert to fraction form
    128,904,778.35/177,892,890.98 = 72,399,481.89/x
  3. Step 3: Cross multiply
    128,904,778.35x = 177,892,890.98 × 72,399,481.89
  4. Step 4: Simplify right side
    128,904,778.35x = 12,879,353,137,614,794
  5. Step 5: Solve for x
    x = 12,879,353,137,614,794/128,904,778.35
  6. Step 6: Final answer
    x = 99,913,698.34

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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.