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Finding the Fourth Proportional to 7,781.80, 10,738.88 and 4,245

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Solution

The fourth proportional to 7,781.80, 10,738.88 and 4,245 is: 5,858.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,781.80 : 10,738.88 = 4,245 : x
  2. Step 2: Convert to fraction form
    7,781.80/10,738.88 = 4,245/x
  3. Step 3: Cross multiply
    7,781.80x = 10,738.88 × 4,245
  4. Step 4: Simplify right side
    7,781.80x = 45,586,545.60
  5. Step 5: Solve for x
    x = 45,586,545.60/7,781.80
  6. Step 6: Final answer
    x = 5,858.10

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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.