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Finding the Fourth Proportional to 12,455.40, 18,683.10 and 3,221.40

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Solution

The fourth proportional to 12,455.40, 18,683.10 and 3,221.40 is: 4,832.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,455.40 : 18,683.10 = 3,221.40 : x
  2. Step 2: Convert to fraction form
    12,455.40/18,683.10 = 3,221.40/x
  3. Step 3: Cross multiply
    12,455.40x = 18,683.10 × 3,221.40
  4. Step 4: Simplify right side
    12,455.40x = 60,185,738.34
  5. Step 5: Solve for x
    x = 60,185,738.34/12,455.40
  6. Step 6: Final answer
    x = 4,832.10

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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.