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Finding the Fourth Proportional to 285,992.67, 428,991.51 and 72,760.78

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Solution

The fourth proportional to 285,992.67, 428,991.51 and 72,760.78 is: 109,141.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    285,992.67 : 428,991.51 = 72,760.78 : x
  2. Step 2: Convert to fraction form
    285,992.67/428,991.51 = 72,760.78/x
  3. Step 3: Cross multiply
    285,992.67x = 428,991.51 × 72,760.78
  4. Step 4: Simplify right side
    285,992.67x = 31,213,754,372.22
  5. Step 5: Solve for x
    x = 31,213,754,372.22/285,992.67
  6. Step 6: Final answer
    x = 109,141.80

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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.