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Finding the Fourth Proportional to 396,407.88, 547,043.23 and 215,119.81

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Solution

The fourth proportional to 396,407.88, 547,043.23 and 215,119.81 is: 296,865.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    396,407.88 : 547,043.23 = 215,119.81 : x
  2. Step 2: Convert to fraction form
    396,407.88/547,043.23 = 215,119.81/x
  3. Step 3: Cross multiply
    396,407.88x = 547,043.23 × 215,119.81
  4. Step 4: Simplify right side
    396,407.88x = 117,679,836,047.07
  5. Step 5: Solve for x
    x = 117,679,836,047.07/396,407.88
  6. Step 6: Final answer
    x = 296,865.53

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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.