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Finding the Fourth Proportional to 10,661.78, 15,992.67 and 2,870.59

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Solution

The fourth proportional to 10,661.78, 15,992.67 and 2,870.59 is: 4,305.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,661.78 : 15,992.67 = 2,870.59 : x
  2. Step 2: Convert to fraction form
    10,661.78/15,992.67 = 2,870.59/x
  3. Step 3: Cross multiply
    10,661.78x = 15,992.67 × 2,870.59
  4. Step 4: Simplify right side
    10,661.78x = 45,908,375.12
  5. Step 5: Solve for x
    x = 45,908,375.12/10,661.78
  6. Step 6: Final answer
    x = 4,305.88

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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.