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Finding the Fourth Proportional to 78,986.54, 109,003.12 and 43,179.89

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Solution

The fourth proportional to 78,986.54, 109,003.12 and 43,179.89 is: 59,589.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,986.54 : 109,003.12 = 43,179.89 : x
  2. Step 2: Convert to fraction form
    78,986.54/109,003.12 = 43,179.89/x
  3. Step 3: Cross multiply
    78,986.54x = 109,003.12 × 43,179.89
  4. Step 4: Simplify right side
    78,986.54x = 4,706,742,078.29
  5. Step 5: Solve for x
    x = 4,706,742,078.29/78,986.54
  6. Step 6: Final answer
    x = 59,589.16

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1.5x scale

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.