Home / 76,986.20-115,479.30-72,685.40

Finding the Fourth Proportional to 76,986.20, 115,479.30 and 72,685.40

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Solution

The fourth proportional to 76,986.20, 115,479.30 and 72,685.40 is: 109,028.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,986.20 : 115,479.30 = 72,685.40 : x
  2. Step 2: Convert to fraction form
    76,986.20/115,479.30 = 72,685.40/x
  3. Step 3: Cross multiply
    76,986.20x = 115,479.30 × 72,685.40
  4. Step 4: Simplify right side
    76,986.20x = 8,393,659,112.22
  5. Step 5: Solve for x
    x = 8,393,659,112.22/76,986.20
  6. Step 6: Final answer
    x = 109,028.10

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.