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Finding the Fourth Proportional to 390,383.96, 538,725.38 and 211,535.96

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Solution

The fourth proportional to 390,383.96, 538,725.38 and 211,535.96 is: 291,917.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,383.96 : 538,725.38 = 211,535.96 : x
  2. Step 2: Convert to fraction form
    390,383.96/538,725.38 = 211,535.96/x
  3. Step 3: Cross multiply
    390,383.96x = 538,725.38 × 211,535.96
  4. Step 4: Simplify right side
    390,383.96x = 113,959,790,434.67
  5. Step 5: Solve for x
    x = 113,959,790,434.67/390,383.96
  6. Step 6: Final answer
    x = 291,917.19

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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.