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Finding the Fourth Proportional to 390,539, 538,943.88 and 211,691

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Solution

The fourth proportional to 390,539, 538,943.88 and 211,691 is: 292,133.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,539 : 538,943.88 = 211,691 : x
  2. Step 2: Convert to fraction form
    390,539/538,943.88 = 211,691/x
  3. Step 3: Cross multiply
    390,539x = 538,943.88 × 211,691
  4. Step 4: Simplify right side
    390,539x = 114,089,568,901.08
  5. Step 5: Solve for x
    x = 114,089,568,901.08/390,539
  6. Step 6: Final answer
    x = 292,133.61

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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.