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Finding the Fourth Proportional to 12,645.55, 18,979.80 and 6,409.90

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Solution

The fourth proportional to 12,645.55, 18,979.80 and 6,409.90 is: 9,620.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,645.55 : 18,979.80 = 6,409.90 : x
  2. Step 2: Convert to fraction form
    12,645.55/18,979.80 = 6,409.90/x
  3. Step 3: Cross multiply
    12,645.55x = 18,979.80 × 6,409.90
  4. Step 4: Simplify right side
    12,645.55x = 121,658,620.02
  5. Step 5: Solve for x
    x = 121,658,620.02/12,645.55
  6. Step 6: Final answer
    x = 9,620.67

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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.