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Finding the Fourth Proportional to 12,387.20, 18,580.80 and 11,026.40

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Solution

The fourth proportional to 12,387.20, 18,580.80 and 11,026.40 is: 16,539.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,387.20 : 18,580.80 = 11,026.40 : x
  2. Step 2: Convert to fraction form
    12,387.20/18,580.80 = 11,026.40/x
  3. Step 3: Cross multiply
    12,387.20x = 18,580.80 × 11,026.40
  4. Step 4: Simplify right side
    12,387.20x = 204,879,333.12
  5. Step 5: Solve for x
    x = 204,879,333.12/12,387.20
  6. Step 6: Final answer
    x = 16,539.60

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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.