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Finding the Fourth Proportional to 12,455.60, 18,661.80 and 8,070.80

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Solution

The fourth proportional to 12,455.60, 18,661.80 and 8,070.80 is: 12,092.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,455.60 : 18,661.80 = 8,070.80 : x
  2. Step 2: Convert to fraction form
    12,455.60/18,661.80 = 8,070.80/x
  3. Step 3: Cross multiply
    12,455.60x = 18,661.80 × 8,070.80
  4. Step 4: Simplify right side
    12,455.60x = 150,615,655.44
  5. Step 5: Solve for x
    x = 150,615,655.44/12,455.60
  6. Step 6: Final answer
    x = 12,092.20

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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.