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Finding the Fourth Proportional to 6,715, 9,267.78 and 3,920.50

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Solution

The fourth proportional to 6,715, 9,267.78 and 3,920.50 is: 5,410.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,715 : 9,267.78 = 3,920.50 : x
  2. Step 2: Convert to fraction form
    6,715/9,267.78 = 3,920.50/x
  3. Step 3: Cross multiply
    6,715x = 9,267.78 × 3,920.50
  4. Step 4: Simplify right side
    6,715x = 36,334,331.49
  5. Step 5: Solve for x
    x = 36,334,331.49/6,715
  6. Step 6: Final answer
    x = 5,410.92

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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.