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Finding the Fourth Proportional to 129,963.58, 179,361.80 and 78,964.56

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Solution

The fourth proportional to 129,963.58, 179,361.80 and 78,964.56 is: 108,978.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,963.58 : 179,361.80 = 78,964.56 : x
  2. Step 2: Convert to fraction form
    129,963.58/179,361.80 = 78,964.56/x
  3. Step 3: Cross multiply
    129,963.58x = 179,361.80 × 78,964.56
  4. Step 4: Simplify right side
    129,963.58x = 14,163,225,617.81
  5. Step 5: Solve for x
    x = 14,163,225,617.81/129,963.58
  6. Step 6: Final answer
    x = 108,978.42

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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.