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Finding the Fourth Proportional to 86,820.20, 130,230.30 and 68,157.80

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Solution

The fourth proportional to 86,820.20, 130,230.30 and 68,157.80 is: 102,236.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,820.20 : 130,230.30 = 68,157.80 : x
  2. Step 2: Convert to fraction form
    86,820.20/130,230.30 = 68,157.80/x
  3. Step 3: Cross multiply
    86,820.20x = 130,230.30 × 68,157.80
  4. Step 4: Simplify right side
    86,820.20x = 8,876,210,741.34
  5. Step 5: Solve for x
    x = 8,876,210,741.34/86,820.20
  6. Step 6: Final answer
    x = 102,236.70

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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.