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Finding the Fourth Proportional to 172,505.68, 258,821.52 and 72,690.88

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Solution

The fourth proportional to 172,505.68, 258,821.52 and 72,690.88 is: 109,062.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,505.68 : 258,821.52 = 72,690.88 : x
  2. Step 2: Convert to fraction form
    172,505.68/258,821.52 = 72,690.88/x
  3. Step 3: Cross multiply
    172,505.68x = 258,821.52 × 72,690.88
  4. Step 4: Simplify right side
    172,505.68x = 18,813,964,051.74
  5. Step 5: Solve for x
    x = 18,813,964,051.74/172,505.68
  6. Step 6: Final answer
    x = 109,062.87

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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.