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Finding the Fourth Proportional to 72,421.56, 108,662.34 and 39,102.45

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Solution

The fourth proportional to 72,421.56, 108,662.34 and 39,102.45 is: 58,669.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,421.56 : 108,662.34 = 39,102.45 : x
  2. Step 2: Convert to fraction form
    72,421.56/108,662.34 = 39,102.45/x
  3. Step 3: Cross multiply
    72,421.56x = 108,662.34 × 39,102.45
  4. Step 4: Simplify right side
    72,421.56x = 4,248,963,716.73
  5. Step 5: Solve for x
    x = 4,248,963,716.73/72,421.56
  6. Step 6: Final answer
    x = 58,669.87

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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.