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Finding the Fourth Proportional to 9,129.65, 13,695.75 and 2,889

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Solution

The fourth proportional to 9,129.65, 13,695.75 and 2,889 is: 4,333.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,129.65 : 13,695.75 = 2,889 : x
  2. Step 2: Convert to fraction form
    9,129.65/13,695.75 = 2,889/x
  3. Step 3: Cross multiply
    9,129.65x = 13,695.75 × 2,889
  4. Step 4: Simplify right side
    9,129.65x = 39,567,021.75
  5. Step 5: Solve for x
    x = 39,567,021.75/9,129.65
  6. Step 6: Final answer
    x = 4,333.91

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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.