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Finding the Fourth Proportional to 7,920.80, 10,929.74 and 6,309.82

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Solution

The fourth proportional to 7,920.80, 10,929.74 and 6,309.82 is: 8,706.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,920.80 : 10,929.74 = 6,309.82 : x
  2. Step 2: Convert to fraction form
    7,920.80/10,929.74 = 6,309.82/x
  3. Step 3: Cross multiply
    7,920.80x = 10,929.74 × 6,309.82
  4. Step 4: Simplify right side
    7,920.80x = 68,964,677.67
  5. Step 5: Solve for x
    x = 68,964,677.67/7,920.80
  6. Step 6: Final answer
    x = 8,706.78

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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.