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Finding the Fourth Proportional to 100,940.95, 139,296.67 and 55,623.12

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Solution

The fourth proportional to 100,940.95, 139,296.67 and 55,623.12 is: 76,758.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,940.95 : 139,296.67 = 55,623.12 : x
  2. Step 2: Convert to fraction form
    100,940.95/139,296.67 = 55,623.12/x
  3. Step 3: Cross multiply
    100,940.95x = 139,296.67 × 55,623.12
  4. Step 4: Simplify right side
    100,940.95x = 7,748,115,391.01
  5. Step 5: Solve for x
    x = 7,748,115,391.01/100,940.95
  6. Step 6: Final answer
    x = 76,758.89

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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.