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Finding the Fourth Proportional to 12,309.60, 18,459.90 and 3,991.80

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Solution

The fourth proportional to 12,309.60, 18,459.90 and 3,991.80 is: 5,986.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,309.60 : 18,459.90 = 3,991.80 : x
  2. Step 2: Convert to fraction form
    12,309.60/18,459.90 = 3,991.80/x
  3. Step 3: Cross multiply
    12,309.60x = 18,459.90 × 3,991.80
  4. Step 4: Simplify right side
    12,309.60x = 73,688,228.82
  5. Step 5: Solve for x
    x = 73,688,228.82/12,309.60
  6. Step 6: Final answer
    x = 5,986.24

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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.