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Finding the Fourth Proportional to 396,425.76, 547,071.56 and 215,139.26

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Solution

The fourth proportional to 396,425.76, 547,071.56 and 215,139.26 is: 296,894.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    396,425.76 : 547,071.56 = 215,139.26 : x
  2. Step 2: Convert to fraction form
    396,425.76/547,071.56 = 215,139.26/x
  3. Step 3: Cross multiply
    396,425.76x = 547,071.56 × 215,139.26
  4. Step 4: Simplify right side
    396,425.76x = 117,696,566,774.39
  5. Step 5: Solve for x
    x = 117,696,566,774.39/396,425.76
  6. Step 6: Final answer
    x = 296,894.35

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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.