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Finding the Fourth Proportional to 72,387.29, 108,431.48 and 53,688.44

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Solution

The fourth proportional to 72,387.29, 108,431.48 and 53,688.44 is: 80,421.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,387.29 : 108,431.48 = 53,688.44 : x
  2. Step 2: Convert to fraction form
    72,387.29/108,431.48 = 53,688.44/x
  3. Step 3: Cross multiply
    72,387.29x = 108,431.48 × 53,688.44
  4. Step 4: Simplify right side
    72,387.29x = 5,821,516,197.49
  5. Step 5: Solve for x
    x = 5,821,516,197.49/72,387.29
  6. Step 6: Final answer
    x = 80,421.81

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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.