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Finding the Fourth Proportional to 80,946.40, 121,419.60 and 76,021.60

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Solution

The fourth proportional to 80,946.40, 121,419.60 and 76,021.60 is: 114,032.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,946.40 : 121,419.60 = 76,021.60 : x
  2. Step 2: Convert to fraction form
    80,946.40/121,419.60 = 76,021.60/x
  3. Step 3: Cross multiply
    80,946.40x = 121,419.60 × 76,021.60
  4. Step 4: Simplify right side
    80,946.40x = 9,230,512,263.36
  5. Step 5: Solve for x
    x = 9,230,512,263.36/80,946.40
  6. Step 6: Final answer
    x = 114,032.40

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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.