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Finding the Fourth Proportional to 78,728.70, 118,080.87 and 28,797.12

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Solution

The fourth proportional to 78,728.70, 118,080.87 and 28,797.12 is: 43,191.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,728.70 : 118,080.87 = 28,797.12 : x
  2. Step 2: Convert to fraction form
    78,728.70/118,080.87 = 28,797.12/x
  3. Step 3: Cross multiply
    78,728.70x = 118,080.87 × 28,797.12
  4. Step 4: Simplify right side
    78,728.70x = 3,400,388,983.09
  5. Step 5: Solve for x
    x = 3,400,388,983.09/78,728.70
  6. Step 6: Final answer
    x = 43,191.22

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1.5x scale

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.