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Finding the Fourth Proportional to 101,431.11, 139,927.77 and 65,632.68

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Solution

The fourth proportional to 101,431.11, 139,927.77 and 65,632.68 is: 90,542.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,431.11 : 139,927.77 = 65,632.68 : x
  2. Step 2: Convert to fraction form
    101,431.11/139,927.77 = 65,632.68/x
  3. Step 3: Cross multiply
    101,431.11x = 139,927.77 × 65,632.68
  4. Step 4: Simplify right side
    101,431.11x = 9,183,834,551.52
  5. Step 5: Solve for x
    x = 9,183,834,551.52/101,431.11
  6. Step 6: Final answer
    x = 90,542.58

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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.