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Finding the Fourth Proportional to 86,489.60, 129,529.60 and 58,636.80

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Solution

The fourth proportional to 86,489.60, 129,529.60 and 58,636.80 is: 87,816.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,489.60 : 129,529.60 = 58,636.80 : x
  2. Step 2: Convert to fraction form
    86,489.60/129,529.60 = 58,636.80/x
  3. Step 3: Cross multiply
    86,489.60x = 129,529.60 × 58,636.80
  4. Step 4: Simplify right side
    86,489.60x = 7,595,201,249.28
  5. Step 5: Solve for x
    x = 7,595,201,249.28/86,489.60
  6. Step 6: Final answer
    x = 87,816.35

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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.