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Finding the Fourth Proportional to 396,388.45, 546,888.81 and 221,932.95

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Solution

The fourth proportional to 396,388.45, 546,888.81 and 221,932.95 is: 306,196.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    396,388.45 : 546,888.81 = 221,932.95 : x
  2. Step 2: Convert to fraction form
    396,388.45/546,888.81 = 221,932.95/x
  3. Step 3: Cross multiply
    396,388.45x = 546,888.81 × 221,932.95
  4. Step 4: Simplify right side
    396,388.45x = 121,372,646,925.29
  5. Step 5: Solve for x
    x = 121,372,646,925.29/396,388.45
  6. Step 6: Final answer
    x = 306,196.22

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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.