Home / 131,291.20-196,936.80-81,208.90

Finding the Fourth Proportional to 131,291.20, 196,936.80 and 81,208.90

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Solution

The fourth proportional to 131,291.20, 196,936.80 and 81,208.90 is: 121,813.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    131,291.20 : 196,936.80 = 81,208.90 : x
  2. Step 2: Convert to fraction form
    131,291.20/196,936.80 = 81,208.90/x
  3. Step 3: Cross multiply
    131,291.20x = 196,936.80 × 81,208.90
  4. Step 4: Simplify right side
    131,291.20x = 15,993,020,897.52
  5. Step 5: Solve for x
    x = 15,993,020,897.52/131,291.20
  6. Step 6: Final answer
    x = 121,813.35

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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.