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Finding the Fourth Proportional to 139,938.55, 209,920.43 and 45,170.98

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Solution

The fourth proportional to 139,938.55, 209,920.43 and 45,170.98 is: 67,760.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,938.55 : 209,920.43 = 45,170.98 : x
  2. Step 2: Convert to fraction form
    139,938.55/209,920.43 = 45,170.98/x
  3. Step 3: Cross multiply
    139,938.55x = 209,920.43 × 45,170.98
  4. Step 4: Simplify right side
    139,938.55x = 9,482,310,879.16
  5. Step 5: Solve for x
    x = 9,482,310,879.16/139,938.55
  6. Step 6: Final answer
    x = 67,760.54

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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.