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Finding the Fourth Proportional to 86,739.60, 130,109.40 and 67,056.60

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Solution

The fourth proportional to 86,739.60, 130,109.40 and 67,056.60 is: 100,584.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,739.60 : 130,109.40 = 67,056.60 : x
  2. Step 2: Convert to fraction form
    86,739.60/130,109.40 = 67,056.60/x
  3. Step 3: Cross multiply
    86,739.60x = 130,109.40 × 67,056.60
  4. Step 4: Simplify right side
    86,739.60x = 8,724,693,992.04
  5. Step 5: Solve for x
    x = 8,724,693,992.04/86,739.60
  6. Step 6: Final answer
    x = 100,584.90

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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.