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Finding the Fourth Proportional to 7,113.12, 9,815.20 and 3,969.44

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Solution

The fourth proportional to 7,113.12, 9,815.20 and 3,969.44 is: 5,477.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,113.12 : 9,815.20 = 3,969.44 : x
  2. Step 2: Convert to fraction form
    7,113.12/9,815.20 = 3,969.44/x
  3. Step 3: Cross multiply
    7,113.12x = 9,815.20 × 3,969.44
  4. Step 4: Simplify right side
    7,113.12x = 38,960,847.49
  5. Step 5: Solve for x
    x = 38,960,847.49/7,113.12
  6. Step 6: Final answer
    x = 5,477.32

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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.