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Finding the Fourth Proportional to 12,405.47, 18,609.15 and 3,520.64

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Solution

The fourth proportional to 12,405.47, 18,609.15 and 3,520.64 is: 5,281.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,405.47 : 18,609.15 = 3,520.64 : x
  2. Step 2: Convert to fraction form
    12,405.47/18,609.15 = 3,520.64/x
  3. Step 3: Cross multiply
    12,405.47x = 18,609.15 × 3,520.64
  4. Step 4: Simplify right side
    12,405.47x = 65,516,024.81
  5. Step 5: Solve for x
    x = 65,516,024.81/12,405.47
  6. Step 6: Final answer
    x = 5,281.22

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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.