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Finding the Fourth Proportional to 12,340.80, 18,511.20 and 6,435.90

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Solution

The fourth proportional to 12,340.80, 18,511.20 and 6,435.90 is: 9,653.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,340.80 : 18,511.20 = 6,435.90 : x
  2. Step 2: Convert to fraction form
    12,340.80/18,511.20 = 6,435.90/x
  3. Step 3: Cross multiply
    12,340.80x = 18,511.20 × 6,435.90
  4. Step 4: Simplify right side
    12,340.80x = 119,136,232.08
  5. Step 5: Solve for x
    x = 119,136,232.08/12,340.80
  6. Step 6: Final answer
    x = 9,653.85

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Similar ratio
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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.