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Finding the Fourth Proportional to 390,177, 538,444.26 and 211,329

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Solution

The fourth proportional to 390,177, 538,444.26 and 211,329 is: 291,634.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,177 : 538,444.26 = 211,329 : x
  2. Step 2: Convert to fraction form
    390,177/538,444.26 = 211,329/x
  3. Step 3: Cross multiply
    390,177x = 538,444.26 × 211,329
  4. Step 4: Simplify right side
    390,177x = 113,788,887,021.54
  5. Step 5: Solve for x
    x = 113,788,887,021.54/390,177
  6. Step 6: Final answer
    x = 291,634.02

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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.