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Finding the Fourth Proportional to 12,135.90, 16,747.99 and 6,831.21

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Solution

The fourth proportional to 12,135.90, 16,747.99 and 6,831.21 is: 9,427.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,135.90 : 16,747.99 = 6,831.21 : x
  2. Step 2: Convert to fraction form
    12,135.90/16,747.99 = 6,831.21/x
  3. Step 3: Cross multiply
    12,135.90x = 16,747.99 × 6,831.21
  4. Step 4: Simplify right side
    12,135.90x = 114,409,019.69
  5. Step 5: Solve for x
    x = 114,409,019.69/12,135.90
  6. Step 6: Final answer
    x = 9,427.32

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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.