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Finding the Fourth Proportional to 443,901.60, 665,938.80 and 128,368.80

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Solution

The fourth proportional to 443,901.60, 665,938.80 and 128,368.80 is: 192,578.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    443,901.60 : 665,938.80 = 128,368.80 : x
  2. Step 2: Convert to fraction form
    443,901.60/665,938.80 = 128,368.80/x
  3. Step 3: Cross multiply
    443,901.60x = 665,938.80 × 128,368.80
  4. Step 4: Simplify right side
    443,901.60x = 85,485,764,629.44
  5. Step 5: Solve for x
    x = 85,485,764,629.44/443,901.60
  6. Step 6: Final answer
    x = 192,578.19

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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.