Home / 12,890.80-19,336.20-8,455.60

Finding the Fourth Proportional to 12,890.80, 19,336.20 and 8,455.60

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Solution

The fourth proportional to 12,890.80, 19,336.20 and 8,455.60 is: 12,683.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,890.80 : 19,336.20 = 8,455.60 : x
  2. Step 2: Convert to fraction form
    12,890.80/19,336.20 = 8,455.60/x
  3. Step 3: Cross multiply
    12,890.80x = 19,336.20 × 8,455.60
  4. Step 4: Simplify right side
    12,890.80x = 163,499,172.72
  5. Step 5: Solve for x
    x = 163,499,172.72/12,890.80
  6. Step 6: Final answer
    x = 12,683.40

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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.