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Finding the Fourth Proportional to 12,140.20, 18,210.30 and 8,203.60

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Solution

The fourth proportional to 12,140.20, 18,210.30 and 8,203.60 is: 12,305.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,140.20 : 18,210.30 = 8,203.60 : x
  2. Step 2: Convert to fraction form
    12,140.20/18,210.30 = 8,203.60/x
  3. Step 3: Cross multiply
    12,140.20x = 18,210.30 × 8,203.60
  4. Step 4: Simplify right side
    12,140.20x = 149,390,017.08
  5. Step 5: Solve for x
    x = 149,390,017.08/12,140.20
  6. Step 6: Final answer
    x = 12,305.40

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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.