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Finding the Fourth Proportional to 12,612.60, 18,918.90 and 11,203.20

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Solution

The fourth proportional to 12,612.60, 18,918.90 and 11,203.20 is: 16,804.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,612.60 : 18,918.90 = 11,203.20 : x
  2. Step 2: Convert to fraction form
    12,612.60/18,918.90 = 11,203.20/x
  3. Step 3: Cross multiply
    12,612.60x = 18,918.90 × 11,203.20
  4. Step 4: Simplify right side
    12,612.60x = 211,952,220.48
  5. Step 5: Solve for x
    x = 211,952,220.48/12,612.60
  6. Step 6: Final answer
    x = 16,804.80

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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.