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Finding the Fourth Proportional to 12,171.80, 16,792.98 and 7,920.92

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Solution

The fourth proportional to 12,171.80, 16,792.98 and 7,920.92 is: 10,928.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,171.80 : 16,792.98 = 7,920.92 : x
  2. Step 2: Convert to fraction form
    12,171.80/16,792.98 = 7,920.92/x
  3. Step 3: Cross multiply
    12,171.80x = 16,792.98 × 7,920.92
  4. Step 4: Simplify right side
    12,171.80x = 133,015,851.14
  5. Step 5: Solve for x
    x = 133,015,851.14/12,171.80
  6. Step 6: Final answer
    x = 10,928.20

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.