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Finding the Fourth Proportional to 3,458.45, 5,187.68 and 861.38

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Solution

The fourth proportional to 3,458.45, 5,187.68 and 861.38 is: 1,292.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,458.45 : 5,187.68 = 861.38 : x
  2. Step 2: Convert to fraction form
    3,458.45/5,187.68 = 861.38/x
  3. Step 3: Cross multiply
    3,458.45x = 5,187.68 × 861.38
  4. Step 4: Simplify right side
    3,458.45x = 4,468,590.26
  5. Step 5: Solve for x
    x = 4,468,590.26/3,458.45
  6. Step 6: Final answer
    x = 1,292.08

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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.