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Finding the Fourth Proportional to 7,847.80, 10,830.20 and 4,311

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Solution

The fourth proportional to 7,847.80, 10,830.20 and 4,311 is: 5,949.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,847.80 : 10,830.20 = 4,311 : x
  2. Step 2: Convert to fraction form
    7,847.80/10,830.20 = 4,311/x
  3. Step 3: Cross multiply
    7,847.80x = 10,830.20 × 4,311
  4. Step 4: Simplify right side
    7,847.80x = 46,688,992.20
  5. Step 5: Solve for x
    x = 46,688,992.20/7,847.80
  6. Step 6: Final answer
    x = 5,949.31

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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.