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Finding the Fourth Proportional to 101,419.80, 139,912.76 and 65,621.48

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Solution

The fourth proportional to 101,419.80, 139,912.76 and 65,621.48 is: 90,527.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,419.80 : 139,912.76 = 65,621.48 : x
  2. Step 2: Convert to fraction form
    101,419.80/139,912.76 = 65,621.48/x
  3. Step 3: Cross multiply
    101,419.80x = 139,912.76 × 65,621.48
  4. Step 4: Simplify right side
    101,419.80x = 9,181,282,382.08
  5. Step 5: Solve for x
    x = 9,181,282,382.08/101,419.80
  6. Step 6: Final answer
    x = 90,527.51

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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.