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Finding the Fourth Proportional to 18,784.80, 25,930.80 and 12,070.80

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Solution

The fourth proportional to 18,784.80, 25,930.80 and 12,070.80 is: 16,662.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,784.80 : 25,930.80 = 12,070.80 : x
  2. Step 2: Convert to fraction form
    18,784.80/25,930.80 = 12,070.80/x
  3. Step 3: Cross multiply
    18,784.80x = 25,930.80 × 12,070.80
  4. Step 4: Simplify right side
    18,784.80x = 313,005,500.64
  5. Step 5: Solve for x
    x = 313,005,500.64/18,784.80
  6. Step 6: Final answer
    x = 16,662.70

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.