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Finding the Fourth Proportional to 72,983.67, 109,473.48 and 20,391.72

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Solution

The fourth proportional to 72,983.67, 109,473.48 and 20,391.72 is: 30,587.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,983.67 : 109,473.48 = 20,391.72 : x
  2. Step 2: Convert to fraction form
    72,983.67/109,473.48 = 20,391.72/x
  3. Step 3: Cross multiply
    72,983.67x = 109,473.48 × 20,391.72
  4. Step 4: Simplify right side
    72,983.67x = 2,232,352,551.59
  5. Step 5: Solve for x
    x = 2,232,352,551.59/72,983.67
  6. Step 6: Final answer
    x = 30,587.01

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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.