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Finding the Fourth Proportional to 86,035.40, 128,793.90 and 76,704.20

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Solution

The fourth proportional to 86,035.40, 128,793.90 and 76,704.20 is: 114,825.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,035.40 : 128,793.90 = 76,704.20 : x
  2. Step 2: Convert to fraction form
    86,035.40/128,793.90 = 76,704.20/x
  3. Step 3: Cross multiply
    86,035.40x = 128,793.90 × 76,704.20
  4. Step 4: Simplify right side
    86,035.40x = 9,879,033,064.38
  5. Step 5: Solve for x
    x = 9,879,033,064.38/86,035.40
  6. Step 6: Final answer
    x = 114,825.21

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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.