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Finding the Fourth Proportional to 139,899.94, 209,879.90 and 45,135.52

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Solution

The fourth proportional to 139,899.94, 209,879.90 and 45,135.52 is: 67,712.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,899.94 : 209,879.90 = 45,135.52 : x
  2. Step 2: Convert to fraction form
    139,899.94/209,879.90 = 45,135.52/x
  3. Step 3: Cross multiply
    139,899.94x = 209,879.90 × 45,135.52
  4. Step 4: Simplify right side
    139,899.94x = 9,473,038,424.05
  5. Step 5: Solve for x
    x = 9,473,038,424.05/139,899.94
  6. Step 6: Final answer
    x = 67,712.96

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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.