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Finding the Fourth Proportional to 86,610.30, 130,012.65 and 66,975.90

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Solution

The fourth proportional to 86,610.30, 130,012.65 and 66,975.90 is: 100,539.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,610.30 : 130,012.65 = 66,975.90 : x
  2. Step 2: Convert to fraction form
    86,610.30/130,012.65 = 66,975.90/x
  3. Step 3: Cross multiply
    86,610.30x = 130,012.65 × 66,975.90
  4. Step 4: Simplify right side
    86,610.30x = 8,707,714,245.14
  5. Step 5: Solve for x
    x = 8,707,714,245.14/86,610.30
  6. Step 6: Final answer
    x = 100,539.01

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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.