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Finding the Fourth Proportional to 86,806.80, 130,015.80 and 67,021.20

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Solution

The fourth proportional to 86,806.80, 130,015.80 and 67,021.20 is: 100,381.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,806.80 : 130,015.80 = 67,021.20 : x
  2. Step 2: Convert to fraction form
    86,806.80/130,015.80 = 67,021.20/x
  3. Step 3: Cross multiply
    86,806.80x = 130,015.80 × 67,021.20
  4. Step 4: Simplify right side
    86,806.80x = 8,713,814,934.96
  5. Step 5: Solve for x
    x = 8,713,814,934.96/86,806.80
  6. Step 6: Final answer
    x = 100,381.71

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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.