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Finding the Fourth Proportional to 7,890.45, 10,881.05 and 6,121.41

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Solution

The fourth proportional to 7,890.45, 10,881.05 and 6,121.41 is: 8,441.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,890.45 : 10,881.05 = 6,121.41 : x
  2. Step 2: Convert to fraction form
    7,890.45/10,881.05 = 6,121.41/x
  3. Step 3: Cross multiply
    7,890.45x = 10,881.05 × 6,121.41
  4. Step 4: Simplify right side
    7,890.45x = 66,607,337.67
  5. Step 5: Solve for x
    x = 66,607,337.67/7,890.45
  6. Step 6: Final answer
    x = 8,441.51

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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.