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Finding the Fourth Proportional to 18,991.20, 28,486.80 and 8,461.20

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Solution

The fourth proportional to 18,991.20, 28,486.80 and 8,461.20 is: 12,691.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,991.20 : 28,486.80 = 8,461.20 : x
  2. Step 2: Convert to fraction form
    18,991.20/28,486.80 = 8,461.20/x
  3. Step 3: Cross multiply
    18,991.20x = 28,486.80 × 8,461.20
  4. Step 4: Simplify right side
    18,991.20x = 241,032,512.16
  5. Step 5: Solve for x
    x = 241,032,512.16/18,991.20
  6. Step 6: Final answer
    x = 12,691.80

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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.