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Finding the Fourth Proportional to 74,940.80, 112,393.20 and 43,282.40

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Solution

The fourth proportional to 74,940.80, 112,393.20 and 43,282.40 is: 64,913.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,940.80 : 112,393.20 = 43,282.40 : x
  2. Step 2: Convert to fraction form
    74,940.80/112,393.20 = 43,282.40/x
  3. Step 3: Cross multiply
    74,940.80x = 112,393.20 × 43,282.40
  4. Step 4: Simplify right side
    74,940.80x = 4,864,647,439.68
  5. Step 5: Solve for x
    x = 4,864,647,439.68/74,940.80
  6. Step 6: Final answer
    x = 64,913.20

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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.