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Finding the Fourth Proportional to 72,297.72, 108,435.60 and 19,711.32

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Solution

The fourth proportional to 72,297.72, 108,435.60 and 19,711.32 is: 29,563.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,297.72 : 108,435.60 = 19,711.32 : x
  2. Step 2: Convert to fraction form
    72,297.72/108,435.60 = 19,711.32/x
  3. Step 3: Cross multiply
    72,297.72x = 108,435.60 × 19,711.32
  4. Step 4: Simplify right side
    72,297.72x = 2,137,408,810.99
  5. Step 5: Solve for x
    x = 2,137,408,810.99/72,297.72
  6. Step 6: Final answer
    x = 29,563.99

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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.