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Finding the Fourth Proportional to 72,928.20, 109,392.30 and 68,007.45

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Solution

The fourth proportional to 72,928.20, 109,392.30 and 68,007.45 is: 102,011.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,928.20 : 109,392.30 = 68,007.45 : x
  2. Step 2: Convert to fraction form
    72,928.20/109,392.30 = 68,007.45/x
  3. Step 3: Cross multiply
    72,928.20x = 109,392.30 × 68,007.45
  4. Step 4: Simplify right side
    72,928.20x = 7,439,491,372.64
  5. Step 5: Solve for x
    x = 7,439,491,372.64/72,928.20
  6. Step 6: Final answer
    x = 102,011.18

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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.