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Finding the Fourth Proportional to 78,989.79, 109,005.94 and 43,179.79

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Solution

The fourth proportional to 78,989.79, 109,005.94 and 43,179.79 is: 59,588.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,989.79 : 109,005.94 = 43,179.79 : x
  2. Step 2: Convert to fraction form
    78,989.79/109,005.94 = 43,179.79/x
  3. Step 3: Cross multiply
    78,989.79x = 109,005.94 × 43,179.79
  4. Step 4: Simplify right side
    78,989.79x = 4,706,852,837.02
  5. Step 5: Solve for x
    x = 4,706,852,837.02/78,989.79
  6. Step 6: Final answer
    x = 59,588.12

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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.