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Finding the Fourth Proportional to 285,993.18, 428,992.61 and 86,315.22

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Solution

The fourth proportional to 285,993.18, 428,992.61 and 86,315.22 is: 129,473.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    285,993.18 : 428,992.61 = 86,315.22 : x
  2. Step 2: Convert to fraction form
    285,993.18/428,992.61 = 86,315.22/x
  3. Step 3: Cross multiply
    285,993.18x = 428,992.61 × 86,315.22
  4. Step 4: Simplify right side
    285,993.18x = 37,028,591,078.95
  5. Step 5: Solve for x
    x = 37,028,591,078.95/285,993.18
  6. Step 6: Final answer
    x = 129,473.69

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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.