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Finding the Fourth Proportional to 6,309.80, 8,706.90 and 3,515

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Solution

The fourth proportional to 6,309.80, 8,706.90 and 3,515 is: 4,850.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,309.80 : 8,706.90 = 3,515 : x
  2. Step 2: Convert to fraction form
    6,309.80/8,706.90 = 3,515/x
  3. Step 3: Cross multiply
    6,309.80x = 8,706.90 × 3,515
  4. Step 4: Simplify right side
    6,309.80x = 30,604,753.50
  5. Step 5: Solve for x
    x = 30,604,753.50/6,309.80
  6. Step 6: Final answer
    x = 4,850.35

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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.