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Finding the Fourth Proportional to 139,541.70, 209,312.55 and 80,492.70

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Solution

The fourth proportional to 139,541.70, 209,312.55 and 80,492.70 is: 120,739.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,541.70 : 209,312.55 = 80,492.70 : x
  2. Step 2: Convert to fraction form
    139,541.70/209,312.55 = 80,492.70/x
  3. Step 3: Cross multiply
    139,541.70x = 209,312.55 × 80,492.70
  4. Step 4: Simplify right side
    139,541.70x = 16,848,132,293.39
  5. Step 5: Solve for x
    x = 16,848,132,293.39/139,541.70
  6. Step 6: Final answer
    x = 120,739.05

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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.