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Finding the Fourth Proportional to 7,987.70, 11,981.55 and 3,054.80

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Solution

The fourth proportional to 7,987.70, 11,981.55 and 3,054.80 is: 4,582.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,987.70 : 11,981.55 = 3,054.80 : x
  2. Step 2: Convert to fraction form
    7,987.70/11,981.55 = 3,054.80/x
  3. Step 3: Cross multiply
    7,987.70x = 11,981.55 × 3,054.80
  4. Step 4: Simplify right side
    7,987.70x = 36,601,238.94
  5. Step 5: Solve for x
    x = 36,601,238.94/7,987.70
  6. Step 6: Final answer
    x = 4,582.20

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Similar ratio
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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.