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Finding the Fourth Proportional to 318,185.80, 439,087.98 and 172,987

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Solution

The fourth proportional to 318,185.80, 439,087.98 and 172,987 is: 238,717.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,185.80 : 439,087.98 = 172,987 : x
  2. Step 2: Convert to fraction form
    318,185.80/439,087.98 = 172,987/x
  3. Step 3: Cross multiply
    318,185.80x = 439,087.98 × 172,987
  4. Step 4: Simplify right side
    318,185.80x = 75,956,512,396.26
  5. Step 5: Solve for x
    x = 75,956,512,396.26/318,185.80
  6. Step 6: Final answer
    x = 238,717.48

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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.