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Finding the Fourth Proportional to 100,717.78, 138,993.93 and 55,397.67

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Solution

The fourth proportional to 100,717.78, 138,993.93 and 55,397.67 is: 76,450.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,717.78 : 138,993.93 = 55,397.67 : x
  2. Step 2: Convert to fraction form
    100,717.78/138,993.93 = 55,397.67/x
  3. Step 3: Cross multiply
    100,717.78x = 138,993.93 × 55,397.67
  4. Step 4: Simplify right side
    100,717.78x = 7,699,939,866.14
  5. Step 5: Solve for x
    x = 7,699,939,866.14/100,717.78
  6. Step 6: Final answer
    x = 76,450.65

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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.