Home / 12,639.18-18,955.89-3,405.90

Finding the Fourth Proportional to 12,639.18, 18,955.89 and 3,405.90

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Solution

The fourth proportional to 12,639.18, 18,955.89 and 3,405.90 is: 5,108.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,639.18 : 18,955.89 = 3,405.90 : x
  2. Step 2: Convert to fraction form
    12,639.18/18,955.89 = 3,405.90/x
  3. Step 3: Cross multiply
    12,639.18x = 18,955.89 × 3,405.90
  4. Step 4: Simplify right side
    12,639.18x = 64,561,865.75
  5. Step 5: Solve for x
    x = 64,561,865.75/12,639.18
  6. Step 6: Final answer
    x = 5,108.07

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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.