Home / 13,639.28-20,459.20-4,279.10

Finding the Fourth Proportional to 13,639.28, 20,459.20 and 4,279.10

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Solution

The fourth proportional to 13,639.28, 20,459.20 and 4,279.10 is: 6,418.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,639.28 : 20,459.20 = 4,279.10 : x
  2. Step 2: Convert to fraction form
    13,639.28/20,459.20 = 4,279.10/x
  3. Step 3: Cross multiply
    13,639.28x = 20,459.20 × 4,279.10
  4. Step 4: Simplify right side
    13,639.28x = 87,546,962.72
  5. Step 5: Solve for x
    x = 87,546,962.72/13,639.28
  6. Step 6: Final answer
    x = 6,418.74

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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.