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Finding the Fourth Proportional to 7,963.76, 11,920.98 and 6,782.78

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Solution

The fourth proportional to 7,963.76, 11,920.98 and 6,782.78 is: 10,153.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,963.76 : 11,920.98 = 6,782.78 : x
  2. Step 2: Convert to fraction form
    7,963.76/11,920.98 = 6,782.78/x
  3. Step 3: Cross multiply
    7,963.76x = 11,920.98 × 6,782.78
  4. Step 4: Simplify right side
    7,963.76x = 80,857,384.72
  5. Step 5: Solve for x
    x = 80,857,384.72/7,963.76
  6. Step 6: Final answer
    x = 10,153.17

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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.