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Finding the Fourth Proportional to 8,617.40, 12,919.70 and 3,420.60

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Solution

The fourth proportional to 8,617.40, 12,919.70 and 3,420.60 is: 5,128.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,617.40 : 12,919.70 = 3,420.60 : x
  2. Step 2: Convert to fraction form
    8,617.40/12,919.70 = 3,420.60/x
  3. Step 3: Cross multiply
    8,617.40x = 12,919.70 × 3,420.60
  4. Step 4: Simplify right side
    8,617.40x = 44,193,125.82
  5. Step 5: Solve for x
    x = 44,193,125.82/8,617.40
  6. Step 6: Final answer
    x = 5,128.36

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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.