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Finding the Fourth Proportional to 72,936.08, 109,404.12 and 20,345.48

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Solution

The fourth proportional to 72,936.08, 109,404.12 and 20,345.48 is: 30,518.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,936.08 : 109,404.12 = 20,345.48 : x
  2. Step 2: Convert to fraction form
    72,936.08/109,404.12 = 20,345.48/x
  3. Step 3: Cross multiply
    72,936.08x = 109,404.12 × 20,345.48
  4. Step 4: Simplify right side
    72,936.08x = 2,225,879,335.38
  5. Step 5: Solve for x
    x = 2,225,879,335.38/72,936.08
  6. Step 6: Final answer
    x = 30,518.22

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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.