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Finding the Fourth Proportional to 3,458.26, 5,187.45 and 861.21

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Solution

The fourth proportional to 3,458.26, 5,187.45 and 861.21 is: 1,291.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,458.26 : 5,187.45 = 861.21 : x
  2. Step 2: Convert to fraction form
    3,458.26/5,187.45 = 861.21/x
  3. Step 3: Cross multiply
    3,458.26x = 5,187.45 × 861.21
  4. Step 4: Simplify right side
    3,458.26x = 4,467,483.81
  5. Step 5: Solve for x
    x = 4,467,483.81/3,458.26
  6. Step 6: Final answer
    x = 1,291.83

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1.5x scale

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.