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Finding the Fourth Proportional to 80,940.40, 121,410.60 and 72,411.10

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Solution

The fourth proportional to 80,940.40, 121,410.60 and 72,411.10 is: 108,616.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,940.40 : 121,410.60 = 72,411.10 : x
  2. Step 2: Convert to fraction form
    80,940.40/121,410.60 = 72,411.10/x
  3. Step 3: Cross multiply
    80,940.40x = 121,410.60 × 72,411.10
  4. Step 4: Simplify right side
    80,940.40x = 8,791,475,097.66
  5. Step 5: Solve for x
    x = 8,791,475,097.66/80,940.40
  6. Step 6: Final answer
    x = 108,616.65

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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.