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Finding the Fourth Proportional to 389,911.52, 538,079.58 and 211,063.52

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Solution

The fourth proportional to 389,911.52, 538,079.58 and 211,063.52 is: 291,268.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,911.52 : 538,079.58 = 211,063.52 : x
  2. Step 2: Convert to fraction form
    389,911.52/538,079.58 = 211,063.52/x
  3. Step 3: Cross multiply
    389,911.52x = 538,079.58 × 211,063.52
  4. Step 4: Simplify right side
    389,911.52x = 113,568,970,194.92
  5. Step 5: Solve for x
    x = 113,568,970,194.92/389,911.52
  6. Step 6: Final answer
    x = 291,268.57

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.