Home / 100,789.81-139,089.96-55,467.78

Finding the Fourth Proportional to 100,789.81, 139,089.96 and 55,467.78

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Solution

The fourth proportional to 100,789.81, 139,089.96 and 55,467.78 is: 76,545.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,789.81 : 139,089.96 = 55,467.78 : x
  2. Step 2: Convert to fraction form
    100,789.81/139,089.96 = 55,467.78/x
  3. Step 3: Cross multiply
    100,789.81x = 139,089.96 × 55,467.78
  4. Step 4: Simplify right side
    100,789.81x = 7,715,010,328.70
  5. Step 5: Solve for x
    x = 7,715,010,328.70/100,789.81
  6. Step 6: Final answer
    x = 76,545.54

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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.