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Finding the Fourth Proportional to 74,524.40, 111,786.56 and 19,120.40

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Solution

The fourth proportional to 74,524.40, 111,786.56 and 19,120.40 is: 28,680.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,524.40 : 111,786.56 = 19,120.40 : x
  2. Step 2: Convert to fraction form
    74,524.40/111,786.56 = 19,120.40/x
  3. Step 3: Cross multiply
    74,524.40x = 111,786.56 × 19,120.40
  4. Step 4: Simplify right side
    74,524.40x = 2,137,403,741.82
  5. Step 5: Solve for x
    x = 2,137,403,741.82/74,524.40
  6. Step 6: Final answer
    x = 28,680.59

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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.