Home / 12,420.72-17,140.20-6,831.68

Finding the Fourth Proportional to 12,420.72, 17,140.20 and 6,831.68

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Solution

The fourth proportional to 12,420.72, 17,140.20 and 6,831.68 is: 9,427.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,420.72 : 17,140.20 = 6,831.68 : x
  2. Step 2: Convert to fraction form
    12,420.72/17,140.20 = 6,831.68/x
  3. Step 3: Cross multiply
    12,420.72x = 17,140.20 × 6,831.68
  4. Step 4: Simplify right side
    12,420.72x = 117,096,361.54
  5. Step 5: Solve for x
    x = 117,096,361.54/12,420.72
  6. Step 6: Final answer
    x = 9,427.50

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.