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Finding the Fourth Proportional to 74,391.82, 111,587.73 and 18,987.82

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Solution

The fourth proportional to 74,391.82, 111,587.73 and 18,987.82 is: 28,481.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,391.82 : 111,587.73 = 18,987.82 : x
  2. Step 2: Convert to fraction form
    74,391.82/111,587.73 = 18,987.82/x
  3. Step 3: Cross multiply
    74,391.82x = 111,587.73 × 18,987.82
  4. Step 4: Simplify right side
    74,391.82x = 2,118,807,731.45
  5. Step 5: Solve for x
    x = 2,118,807,731.45/74,391.82
  6. Step 6: Final answer
    x = 28,481.73

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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.