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Finding the Fourth Proportional to 6,601.60, 9,909.60 and 4,139.20

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Solution

The fourth proportional to 6,601.60, 9,909.60 and 4,139.20 is: 6,213.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,601.60 : 9,909.60 = 4,139.20 : x
  2. Step 2: Convert to fraction form
    6,601.60/9,909.60 = 4,139.20/x
  3. Step 3: Cross multiply
    6,601.60x = 9,909.60 × 4,139.20
  4. Step 4: Simplify right side
    6,601.60x = 41,017,816.32
  5. Step 5: Solve for x
    x = 41,017,816.32/6,601.60
  6. Step 6: Final answer
    x = 6,213.31

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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.