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Finding the Fourth Proportional to 64,812.72, 97,221.15 and 20,439.87

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Solution

The fourth proportional to 64,812.72, 97,221.15 and 20,439.87 is: 30,660.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    64,812.72 : 97,221.15 = 20,439.87 : x
  2. Step 2: Convert to fraction form
    64,812.72/97,221.15 = 20,439.87/x
  3. Step 3: Cross multiply
    64,812.72x = 97,221.15 × 20,439.87
  4. Step 4: Simplify right side
    64,812.72x = 1,987,187,667.25
  5. Step 5: Solve for x
    x = 1,987,187,667.25/64,812.72
  6. Step 6: Final answer
    x = 30,660.46

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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.