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Finding the Fourth Proportional to 6,909.87, 9,518.94 and 5,709.87

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Solution

The fourth proportional to 6,909.87, 9,518.94 and 5,709.87 is: 7,865.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,909.87 : 9,518.94 = 5,709.87 : x
  2. Step 2: Convert to fraction form
    6,909.87/9,518.94 = 5,709.87/x
  3. Step 3: Cross multiply
    6,909.87x = 9,518.94 × 5,709.87
  4. Step 4: Simplify right side
    6,909.87x = 54,351,909.94
  5. Step 5: Solve for x
    x = 54,351,909.94/6,909.87
  6. Step 6: Final answer
    x = 7,865.84

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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.