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Finding the Fourth Proportional to 85,791.72, 118,399.14 and 53,987.88

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Solution

The fourth proportional to 85,791.72, 118,399.14 and 53,987.88 is: 74,507.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,791.72 : 118,399.14 = 53,987.88 : x
  2. Step 2: Convert to fraction form
    85,791.72/118,399.14 = 53,987.88/x
  3. Step 3: Cross multiply
    85,791.72x = 118,399.14 × 53,987.88
  4. Step 4: Simplify right side
    85,791.72x = 6,392,118,562.42
  5. Step 5: Solve for x
    x = 6,392,118,562.42/85,791.72
  6. Step 6: Final answer
    x = 74,507.41

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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.