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Finding the Fourth Proportional to 396,960.40, 595,440.60 and 390,048.40

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Solution

The fourth proportional to 396,960.40, 595,440.60 and 390,048.40 is: 585,072.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    396,960.40 : 595,440.60 = 390,048.40 : x
  2. Step 2: Convert to fraction form
    396,960.40/595,440.60 = 390,048.40/x
  3. Step 3: Cross multiply
    396,960.40x = 595,440.60 × 390,048.40
  4. Step 4: Simplify right side
    396,960.40x = 232,250,653,325.04
  5. Step 5: Solve for x
    x = 232,250,653,325.04/396,960.40
  6. Step 6: Final answer
    x = 585,072.60

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.