Home / 12,639.81-18,976.11-9,720.18

Finding the Fourth Proportional to 12,639.81, 18,976.11 and 9,720.18

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Solution

The fourth proportional to 12,639.81, 18,976.11 and 9,720.18 is: 14,592.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,639.81 : 18,976.11 = 9,720.18 : x
  2. Step 2: Convert to fraction form
    12,639.81/18,976.11 = 9,720.18/x
  3. Step 3: Cross multiply
    12,639.81x = 18,976.11 × 9,720.18
  4. Step 4: Simplify right side
    12,639.81x = 184,451,204.90
  5. Step 5: Solve for x
    x = 184,451,204.90/12,639.81
  6. Step 6: Final answer
    x = 14,592.88

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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.