Home / 12,756.18-19,134.12-3,990.87

Finding the Fourth Proportional to 12,756.18, 19,134.12 and 3,990.87

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Solution

The fourth proportional to 12,756.18, 19,134.12 and 3,990.87 is: 5,986.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,756.18 : 19,134.12 = 3,990.87 : x
  2. Step 2: Convert to fraction form
    12,756.18/19,134.12 = 3,990.87/x
  3. Step 3: Cross multiply
    12,756.18x = 19,134.12 × 3,990.87
  4. Step 4: Simplify right side
    12,756.18x = 76,361,800.45
  5. Step 5: Solve for x
    x = 76,361,800.45/12,756.18
  6. Step 6: Final answer
    x = 5,986.26

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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.