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Finding the Fourth Proportional to 107,918.60, 161,877.90 and 85,611.20

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Solution

The fourth proportional to 107,918.60, 161,877.90 and 85,611.20 is: 128,416.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    107,918.60 : 161,877.90 = 85,611.20 : x
  2. Step 2: Convert to fraction form
    107,918.60/161,877.90 = 85,611.20/x
  3. Step 3: Cross multiply
    107,918.60x = 161,877.90 × 85,611.20
  4. Step 4: Simplify right side
    107,918.60x = 13,858,561,272.48
  5. Step 5: Solve for x
    x = 13,858,561,272.48/107,918.60
  6. Step 6: Final answer
    x = 128,416.80

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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.