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Finding the Fourth Proportional to 73,187.20, 109,809.60 and 28,806.40

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Solution

The fourth proportional to 73,187.20, 109,809.60 and 28,806.40 is: 43,220.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    73,187.20 : 109,809.60 = 28,806.40 : x
  2. Step 2: Convert to fraction form
    73,187.20/109,809.60 = 28,806.40/x
  3. Step 3: Cross multiply
    73,187.20x = 109,809.60 × 28,806.40
  4. Step 4: Simplify right side
    73,187.20x = 3,163,219,261.44
  5. Step 5: Solve for x
    x = 3,163,219,261.44/73,187.20
  6. Step 6: Final answer
    x = 43,220.94

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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.