Home / 129,980.12-179,369.26-72,619.88

Finding the Fourth Proportional to 129,980.12, 179,369.26 and 72,619.88

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Solution

The fourth proportional to 129,980.12, 179,369.26 and 72,619.88 is: 100,213.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,980.12 : 179,369.26 = 72,619.88 : x
  2. Step 2: Convert to fraction form
    129,980.12/179,369.26 = 72,619.88/x
  3. Step 3: Cross multiply
    129,980.12x = 179,369.26 × 72,619.88
  4. Step 4: Simplify right side
    129,980.12x = 13,025,774,136.89
  5. Step 5: Solve for x
    x = 13,025,774,136.89/129,980.12
  6. Step 6: Final answer
    x = 100,213.59

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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.