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Finding the Fourth Proportional to 6,409.62, 9,621.72 and 5,986.80

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Solution

The fourth proportional to 6,409.62, 9,621.72 and 5,986.80 is: 8,987.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,409.62 : 9,621.72 = 5,986.80 : x
  2. Step 2: Convert to fraction form
    6,409.62/9,621.72 = 5,986.80/x
  3. Step 3: Cross multiply
    6,409.62x = 9,621.72 × 5,986.80
  4. Step 4: Simplify right side
    6,409.62x = 57,603,313.30
  5. Step 5: Solve for x
    x = 57,603,313.30/6,409.62
  6. Step 6: Final answer
    x = 8,987.01

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.