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Finding the Fourth Proportional to 25,990.30, 38,978.28 and 10,992.34

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Solution

The fourth proportional to 25,990.30, 38,978.28 and 10,992.34 is: 16,485.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    25,990.30 : 38,978.28 = 10,992.34 : x
  2. Step 2: Convert to fraction form
    25,990.30/38,978.28 = 10,992.34/x
  3. Step 3: Cross multiply
    25,990.30x = 38,978.28 × 10,992.34
  4. Step 4: Simplify right side
    25,990.30x = 428,462,506.38
  5. Step 5: Solve for x
    x = 428,462,506.38/25,990.30
  6. Step 6: Final answer
    x = 16,485.48

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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.