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Finding the Fourth Proportional to 422,674.60, 634,071.12 and 138,387.40

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Solution

The fourth proportional to 422,674.60, 634,071.12 and 138,387.40 is: 207,600.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    422,674.60 : 634,071.12 = 138,387.40 : x
  2. Step 2: Convert to fraction form
    422,674.60/634,071.12 = 138,387.40/x
  3. Step 3: Cross multiply
    422,674.60x = 634,071.12 × 138,387.40
  4. Step 4: Simplify right side
    422,674.60x = 87,747,453,711.89
  5. Step 5: Solve for x
    x = 87,747,453,711.89/422,674.60
  6. Step 6: Final answer
    x = 207,600.49

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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.