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Finding the Fourth Proportional to 72,451.70, 108,672.15 and 30,320.90

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Solution

The fourth proportional to 72,451.70, 108,672.15 and 30,320.90 is: 45,479.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,451.70 : 108,672.15 = 30,320.90 : x
  2. Step 2: Convert to fraction form
    72,451.70/108,672.15 = 30,320.90/x
  3. Step 3: Cross multiply
    72,451.70x = 108,672.15 × 30,320.90
  4. Step 4: Simplify right side
    72,451.70x = 3,295,037,392.94
  5. Step 5: Solve for x
    x = 3,295,037,392.94/72,451.70
  6. Step 6: Final answer
    x = 45,479.09

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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.