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Finding the Fourth Proportional to 86,990.87, 130,322.64 and 68,213.90

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Solution

The fourth proportional to 86,990.87, 130,322.64 and 68,213.90 is: 102,192.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,990.87 : 130,322.64 = 68,213.90 : x
  2. Step 2: Convert to fraction form
    86,990.87/130,322.64 = 68,213.90/x
  3. Step 3: Cross multiply
    86,990.87x = 130,322.64 × 68,213.90
  4. Step 4: Simplify right side
    86,990.87x = 8,889,815,532.70
  5. Step 5: Solve for x
    x = 8,889,815,532.70/86,990.87
  6. Step 6: Final answer
    x = 102,192.51

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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.