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Finding the Fourth Proportional to 172,696.80, 258,968.40 and 79,231.20

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Solution

The fourth proportional to 172,696.80, 258,968.40 and 79,231.20 is: 118,811.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,696.80 : 258,968.40 = 79,231.20 : x
  2. Step 2: Convert to fraction form
    172,696.80/258,968.40 = 79,231.20/x
  3. Step 3: Cross multiply
    172,696.80x = 258,968.40 × 79,231.20
  4. Step 4: Simplify right side
    172,696.80x = 20,518,377,094.08
  5. Step 5: Solve for x
    x = 20,518,377,094.08/172,696.80
  6. Step 6: Final answer
    x = 118,811.57

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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.