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Finding the Fourth Proportional to 72,173.15, 99,594.92 and 39,905.90

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Solution

The fourth proportional to 72,173.15, 99,594.92 and 39,905.90 is: 55,067.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,173.15 : 99,594.92 = 39,905.90 : x
  2. Step 2: Convert to fraction form
    72,173.15/99,594.92 = 39,905.90/x
  3. Step 3: Cross multiply
    72,173.15x = 99,594.92 × 39,905.90
  4. Step 4: Simplify right side
    72,173.15x = 3,974,425,088.99
  5. Step 5: Solve for x
    x = 3,974,425,088.99/72,173.15
  6. Step 6: Final answer
    x = 55,067.92

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.