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Finding the Fourth Proportional to 100,715.78, 138,991.17 and 55,395.67

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Solution

The fourth proportional to 100,715.78, 138,991.17 and 55,395.67 is: 76,447.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,715.78 : 138,991.17 = 55,395.67 : x
  2. Step 2: Convert to fraction form
    100,715.78/138,991.17 = 55,395.67/x
  3. Step 3: Cross multiply
    100,715.78x = 138,991.17 × 55,395.67
  4. Step 4: Simplify right side
    100,715.78x = 7,699,508,986.23
  5. Step 5: Solve for x
    x = 7,699,508,986.23/100,715.78
  6. Step 6: Final answer
    x = 76,447.89

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1.5x scale

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.