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Finding the Fourth Proportional to 139,699.50, 209,403.38 and 64,757.85

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Solution

The fourth proportional to 139,699.50, 209,403.38 and 64,757.85 is: 97,069.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,699.50 : 209,403.38 = 64,757.85 : x
  2. Step 2: Convert to fraction form
    139,699.50/209,403.38 = 64,757.85/x
  3. Step 3: Cross multiply
    139,699.50x = 209,403.38 × 64,757.85
  4. Step 4: Simplify right side
    139,699.50x = 13,560,511,683.90
  5. Step 5: Solve for x
    x = 13,560,511,683.90/139,699.50
  6. Step 6: Final answer
    x = 97,069.15

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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.