Home / 12,172.70-18,218.55-8,831.45

Finding the Fourth Proportional to 12,172.70, 18,218.55 and 8,831.45

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Solution

The fourth proportional to 12,172.70, 18,218.55 and 8,831.45 is: 13,217.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,172.70 : 18,218.55 = 8,831.45 : x
  2. Step 2: Convert to fraction form
    12,172.70/18,218.55 = 8,831.45/x
  3. Step 3: Cross multiply
    12,172.70x = 18,218.55 × 8,831.45
  4. Step 4: Simplify right side
    12,172.70x = 160,896,213.40
  5. Step 5: Solve for x
    x = 160,896,213.40/12,172.70
  6. Step 6: Final answer
    x = 13,217.79

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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.