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Finding the Fourth Proportional to 12,135.60, 18,203.40 and 7,220.40

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Solution

The fourth proportional to 12,135.60, 18,203.40 and 7,220.40 is: 10,830.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,135.60 : 18,203.40 = 7,220.40 : x
  2. Step 2: Convert to fraction form
    12,135.60/18,203.40 = 7,220.40/x
  3. Step 3: Cross multiply
    12,135.60x = 18,203.40 × 7,220.40
  4. Step 4: Simplify right side
    12,135.60x = 131,435,829.36
  5. Step 5: Solve for x
    x = 131,435,829.36/12,135.60
  6. Step 6: Final answer
    x = 10,830.60

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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.