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Finding the Fourth Proportional to 139,907.70, 209,861.55 and 80,712.90

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Solution

The fourth proportional to 139,907.70, 209,861.55 and 80,712.90 is: 121,069.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,907.70 : 209,861.55 = 80,712.90 : x
  2. Step 2: Convert to fraction form
    139,907.70/209,861.55 = 80,712.90/x
  3. Step 3: Cross multiply
    139,907.70x = 209,861.55 × 80,712.90
  4. Step 4: Simplify right side
    139,907.70x = 16,938,534,299.00
  5. Step 5: Solve for x
    x = 16,938,534,299.00/139,907.70
  6. Step 6: Final answer
    x = 121,069.35

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1.5x scale

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.