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Finding the Fourth Proportional to 120,731.40, 181,121.40 and 101,145.60

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Solution

The fourth proportional to 120,731.40, 181,121.40 and 101,145.60 is: 151,738.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,731.40 : 181,121.40 = 101,145.60 : x
  2. Step 2: Convert to fraction form
    120,731.40/181,121.40 = 101,145.60/x
  3. Step 3: Cross multiply
    120,731.40x = 181,121.40 × 101,145.60
  4. Step 4: Simplify right side
    120,731.40x = 18,319,632,675.84
  5. Step 5: Solve for x
    x = 18,319,632,675.84/120,731.40
  6. Step 6: Final answer
    x = 151,738.76

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.