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Finding the Fourth Proportional to 422,930.66, 634,527.50 and 138,623.69

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Solution

The fourth proportional to 422,930.66, 634,527.50 and 138,623.69 is: 207,978.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    422,930.66 : 634,527.50 = 138,623.69 : x
  2. Step 2: Convert to fraction form
    422,930.66/634,527.50 = 138,623.69/x
  3. Step 3: Cross multiply
    422,930.66x = 634,527.50 × 138,623.69
  4. Step 4: Simplify right side
    422,930.66x = 87,960,539,590.72
  5. Step 5: Solve for x
    x = 87,960,539,590.72/422,930.66
  6. Step 6: Final answer
    x = 207,978.63

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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.