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Finding the Fourth Proportional to 139,355.75, 209,068.35 and 40,859.75

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Solution

The fourth proportional to 139,355.75, 209,068.35 and 40,859.75 is: 61,299.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,355.75 : 209,068.35 = 40,859.75 : x
  2. Step 2: Convert to fraction form
    139,355.75/209,068.35 = 40,859.75/x
  3. Step 3: Cross multiply
    139,355.75x = 209,068.35 × 40,859.75
  4. Step 4: Simplify right side
    139,355.75x = 8,542,480,513.91
  5. Step 5: Solve for x
    x = 8,542,480,513.91/139,355.75
  6. Step 6: Final answer
    x = 61,299.81

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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.