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Finding the Fourth Proportional to 12,487.20, 18,730.80 and 12,199.20

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Solution

The fourth proportional to 12,487.20, 18,730.80 and 12,199.20 is: 18,298.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,487.20 : 18,730.80 = 12,199.20 : x
  2. Step 2: Convert to fraction form
    12,487.20/18,730.80 = 12,199.20/x
  3. Step 3: Cross multiply
    12,487.20x = 18,730.80 × 12,199.20
  4. Step 4: Simplify right side
    12,487.20x = 228,500,775.36
  5. Step 5: Solve for x
    x = 228,500,775.36/12,487.20
  6. Step 6: Final answer
    x = 18,298.80

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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.