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Finding the Fourth Proportional to 81,987.90, 113,185.95 and 55,270.86

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Solution

The fourth proportional to 81,987.90, 113,185.95 and 55,270.86 is: 76,302.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,987.90 : 113,185.95 = 55,270.86 : x
  2. Step 2: Convert to fraction form
    81,987.90/113,185.95 = 55,270.86/x
  3. Step 3: Cross multiply
    81,987.90x = 113,185.95 × 55,270.86
  4. Step 4: Simplify right side
    81,987.90x = 6,255,884,796.42
  5. Step 5: Solve for x
    x = 6,255,884,796.42/81,987.90
  6. Step 6: Final answer
    x = 76,302.54

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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.