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Finding the Fourth Proportional to 131,993.80, 197,721.90 and 81,920.20

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Solution

The fourth proportional to 131,993.80, 197,721.90 and 81,920.20 is: 122,713.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    131,993.80 : 197,721.90 = 81,920.20 : x
  2. Step 2: Convert to fraction form
    131,993.80/197,721.90 = 81,920.20/x
  3. Step 3: Cross multiply
    131,993.80x = 197,721.90 × 81,920.20
  4. Step 4: Simplify right side
    131,993.80x = 16,197,417,592.38
  5. Step 5: Solve for x
    x = 16,197,417,592.38/131,993.80
  6. Step 6: Final answer
    x = 122,713.47

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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.