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Finding the Fourth Proportional to 111,645.76, 154,049.44 and 71,328.56

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Solution

The fourth proportional to 111,645.76, 154,049.44 and 71,328.56 is: 98,419.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,645.76 : 154,049.44 = 71,328.56 : x
  2. Step 2: Convert to fraction form
    111,645.76/154,049.44 = 71,328.56/x
  3. Step 3: Cross multiply
    111,645.76x = 154,049.44 × 71,328.56
  4. Step 4: Simplify right side
    111,645.76x = 10,988,124,724.01
  5. Step 5: Solve for x
    x = 10,988,124,724.01/111,645.76
  6. Step 6: Final answer
    x = 98,419.54

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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.