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Finding the Fourth Proportional to 78,987.44, 109,002.42 and 43,177.46

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Solution

The fourth proportional to 78,987.44, 109,002.42 and 43,177.46 is: 59,584.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,987.44 : 109,002.42 = 43,177.46 : x
  2. Step 2: Convert to fraction form
    78,987.44/109,002.42 = 43,177.46/x
  3. Step 3: Cross multiply
    78,987.44x = 109,002.42 × 43,177.46
  4. Step 4: Simplify right side
    78,987.44x = 4,706,447,629.45
  5. Step 5: Solve for x
    x = 4,706,447,629.45/78,987.44
  6. Step 6: Final answer
    x = 59,584.76

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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.