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Finding the Fourth Proportional to 7,920.80, 11,880.93 and 3,763.79

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Solution

The fourth proportional to 7,920.80, 11,880.93 and 3,763.79 is: 5,645.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,920.80 : 11,880.93 = 3,763.79 : x
  2. Step 2: Convert to fraction form
    7,920.80/11,880.93 = 3,763.79/x
  3. Step 3: Cross multiply
    7,920.80x = 11,880.93 × 3,763.79
  4. Step 4: Simplify right side
    7,920.80x = 44,717,266.12
  5. Step 5: Solve for x
    x = 44,717,266.12/7,920.80
  6. Step 6: Final answer
    x = 5,645.55

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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.