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Finding the Fourth Proportional to 72,451.40, 108,664.79 and 19,143.96

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Solution

The fourth proportional to 72,451.40, 108,664.79 and 19,143.96 is: 28,712.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,451.40 : 108,664.79 = 19,143.96 : x
  2. Step 2: Convert to fraction form
    72,451.40/108,664.79 = 19,143.96/x
  3. Step 3: Cross multiply
    72,451.40x = 108,664.79 × 19,143.96
  4. Step 4: Simplify right side
    72,451.40x = 2,080,273,889.96
  5. Step 5: Solve for x
    x = 2,080,273,889.96/72,451.40
  6. Step 6: Final answer
    x = 28,712.68

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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.