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Finding the Fourth Proportional to 13,639.70, 20,459.55 and 4,405.70

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Solution

The fourth proportional to 13,639.70, 20,459.55 and 4,405.70 is: 6,608.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,639.70 : 20,459.55 = 4,405.70 : x
  2. Step 2: Convert to fraction form
    13,639.70/20,459.55 = 4,405.70/x
  3. Step 3: Cross multiply
    13,639.70x = 20,459.55 × 4,405.70
  4. Step 4: Simplify right side
    13,639.70x = 90,138,639.44
  5. Step 5: Solve for x
    x = 90,138,639.44/13,639.70
  6. Step 6: Final answer
    x = 6,608.55

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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.