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Finding the Fourth Proportional to 139,986.70, 209,980.05 and 80,937.70

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Solution

The fourth proportional to 139,986.70, 209,980.05 and 80,937.70 is: 121,406.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,986.70 : 209,980.05 = 80,937.70 : x
  2. Step 2: Convert to fraction form
    139,986.70/209,980.05 = 80,937.70/x
  3. Step 3: Cross multiply
    139,986.70x = 209,980.05 × 80,937.70
  4. Step 4: Simplify right side
    139,986.70x = 16,995,302,292.89
  5. Step 5: Solve for x
    x = 16,995,302,292.89/139,986.70
  6. Step 6: Final answer
    x = 121,406.55

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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.