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Finding the Fourth Proportional to 85,505.60, 128,112.60 and 72,966.80

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Solution

The fourth proportional to 85,505.60, 128,112.60 and 72,966.80 is: 109,325.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,505.60 : 128,112.60 = 72,966.80 : x
  2. Step 2: Convert to fraction form
    85,505.60/128,112.60 = 72,966.80/x
  3. Step 3: Cross multiply
    85,505.60x = 128,112.60 × 72,966.80
  4. Step 4: Simplify right side
    85,505.60x = 9,347,966,461.68
  5. Step 5: Solve for x
    x = 9,347,966,461.68/85,505.60
  6. Step 6: Final answer
    x = 109,325.78

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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.