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Finding the Fourth Proportional to 7,929.80, 10,920.93 and 7,757.61

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Solution

The fourth proportional to 7,929.80, 10,920.93 and 7,757.61 is: 10,683.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,929.80 : 10,920.93 = 7,757.61 : x
  2. Step 2: Convert to fraction form
    7,929.80/10,920.93 = 7,757.61/x
  3. Step 3: Cross multiply
    7,929.80x = 10,920.93 × 7,757.61
  4. Step 4: Simplify right side
    7,929.80x = 84,720,315.78
  5. Step 5: Solve for x
    x = 84,720,315.78/7,929.80
  6. Step 6: Final answer
    x = 10,683.79

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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.