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Finding the Fourth Proportional to 86,665.60, 129,852.60 and 81,416.80

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Solution

The fourth proportional to 86,665.60, 129,852.60 and 81,416.80 is: 121,988.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,665.60 : 129,852.60 = 81,416.80 : x
  2. Step 2: Convert to fraction form
    86,665.60/129,852.60 = 81,416.80/x
  3. Step 3: Cross multiply
    86,665.60x = 129,852.60 × 81,416.80
  4. Step 4: Simplify right side
    86,665.60x = 10,572,183,163.68
  5. Step 5: Solve for x
    x = 10,572,183,163.68/86,665.60
  6. Step 6: Final answer
    x = 121,988.23

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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.