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Finding the Fourth Proportional to 86,929.60, 130,221.60 and 80,708.80

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Solution

The fourth proportional to 86,929.60, 130,221.60 and 80,708.80 is: 120,902.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,929.60 : 130,221.60 = 80,708.80 : x
  2. Step 2: Convert to fraction form
    86,929.60/130,221.60 = 80,708.80/x
  3. Step 3: Cross multiply
    86,929.60x = 130,221.60 × 80,708.80
  4. Step 4: Simplify right side
    86,929.60x = 10,510,029,070.08
  5. Step 5: Solve for x
    x = 10,510,029,070.08/86,929.60
  6. Step 6: Final answer
    x = 120,902.77

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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.