Home / 101,428.11-139,923.63-65,629.68

Finding the Fourth Proportional to 101,428.11, 139,923.63 and 65,629.68

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Solution

The fourth proportional to 101,428.11, 139,923.63 and 65,629.68 is: 90,538.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,428.11 : 139,923.63 = 65,629.68 : x
  2. Step 2: Convert to fraction form
    101,428.11/139,923.63 = 65,629.68/x
  3. Step 3: Cross multiply
    101,428.11x = 139,923.63 × 65,629.68
  4. Step 4: Simplify right side
    101,428.11x = 9,183,143,061.34
  5. Step 5: Solve for x
    x = 9,183,143,061.34/101,428.11
  6. Step 6: Final answer
    x = 90,538.44

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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.