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Finding the Fourth Proportional to 139,928.60, 209,740.37 and 68,709.86

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Solution

The fourth proportional to 139,928.60, 209,740.37 and 68,709.86 is: 102,989.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,928.60 : 209,740.37 = 68,709.86 : x
  2. Step 2: Convert to fraction form
    139,928.60/209,740.37 = 68,709.86/x
  3. Step 3: Cross multiply
    139,928.60x = 209,740.37 × 68,709.86
  4. Step 4: Simplify right side
    139,928.60x = 14,411,231,459.05
  5. Step 5: Solve for x
    x = 14,411,231,459.05/139,928.60
  6. Step 6: Final answer
    x = 102,989.89

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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.