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Finding the Fourth Proportional to 139,918.20, 209,877.30 and 80,723.40

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Solution

The fourth proportional to 139,918.20, 209,877.30 and 80,723.40 is: 121,085.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,918.20 : 209,877.30 = 80,723.40 : x
  2. Step 2: Convert to fraction form
    139,918.20/209,877.30 = 80,723.40/x
  3. Step 3: Cross multiply
    139,918.20x = 209,877.30 × 80,723.40
  4. Step 4: Simplify right side
    139,918.20x = 16,942,009,238.82
  5. Step 5: Solve for x
    x = 16,942,009,238.82/139,918.20
  6. Step 6: Final answer
    x = 121,085.10

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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.