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Finding the Fourth Proportional to 425,440.80, 638,161.20 and 188,807.40

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Solution

The fourth proportional to 425,440.80, 638,161.20 and 188,807.40 is: 283,211.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,440.80 : 638,161.20 = 188,807.40 : x
  2. Step 2: Convert to fraction form
    425,440.80/638,161.20 = 188,807.40/x
  3. Step 3: Cross multiply
    425,440.80x = 638,161.20 × 188,807.40
  4. Step 4: Simplify right side
    425,440.80x = 120,489,556,952.88
  5. Step 5: Solve for x
    x = 120,489,556,952.88/425,440.80
  6. Step 6: Final answer
    x = 283,211.10

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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.