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Finding the Fourth Proportional to 172,720.40, 259,115.84 and 72,880.60

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Solution

The fourth proportional to 172,720.40, 259,115.84 and 72,880.60 is: 109,335.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,720.40 : 259,115.84 = 72,880.60 : x
  2. Step 2: Convert to fraction form
    172,720.40/259,115.84 = 72,880.60/x
  3. Step 3: Cross multiply
    172,720.40x = 259,115.84 × 72,880.60
  4. Step 4: Simplify right side
    172,720.40x = 18,884,517,888.70
  5. Step 5: Solve for x
    x = 18,884,517,888.70/172,720.40
  6. Step 6: Final answer
    x = 109,335.77

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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.