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Finding the Fourth Proportional to 7,782.84, 11,615.76 and 7,121.88

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Solution

The fourth proportional to 7,782.84, 11,615.76 and 7,121.88 is: 10,629.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,782.84 : 11,615.76 = 7,121.88 : x
  2. Step 2: Convert to fraction form
    7,782.84/11,615.76 = 7,121.88/x
  3. Step 3: Cross multiply
    7,782.84x = 11,615.76 × 7,121.88
  4. Step 4: Simplify right side
    7,782.84x = 82,726,048.83
  5. Step 5: Solve for x
    x = 82,726,048.83/7,782.84
  6. Step 6: Final answer
    x = 10,629.29

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.